Javascript CSS代码如何把导航放在中间
我正在开发一个网页，其中的屏幕将适合移动也 style.cssJavascript CSS代码如何把导航放在中间,javascript,jquery,html,css,Javascript,Jquery,Html,Css,我正在开发一个网页，其中的屏幕将适合移动也 style.css /* GENERAL STUFF */ * { margin: 0; padding: 0; } body { width: 100%; font-family: 'Cabin', sans-serif; } /*.clear { clear: both; }*/ .clear:after { display: block; clear: both; visib
/* GENERAL STUFF */
* {
margin: 0;
padding: 0;
}
body {
width: 100%;
font-family: 'Cabin', sans-serif;
}
/*.clear {
clear: both;
}*/
.clear:after {
display: block;
clear: both;
visibility: hidden;
content: "";
height: 0;
}
/* HEADER BLOCK */
.header-background {
padding-top: 50px;
}
.header-background > div:first-child {
width: 100%;
background: #232323;
}
.header {
background: #232323;
color: #B2B2B2;
width: 80%;
margin: auto;
}
.header a {
text-decoration: none;
color: white;
}
.header a:active {
color: #19A3A3;
}
#nav {
position: relative;
display: block;
height: 55px;
line-height: 55px;
width: 100%;
max-width: none;
margin: 0;
background: #333;
z-index: 1;
border-bottom: 1px solid #666;
font-weight: 600;
font-family: helvetica, arial, sans-serif;
font-size: 14px;
}
#nav, #nav * {
-webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
-moz-box-sizing: border-box; /* Firefox, other Gecko */
box-sizing: border-box; /* Opera/IE 8+ */
}
.nav-item {
color: #fff;
text-transform: uppercase;
text-decoration: none;
}
/* Desktop */
#desktop-nav .nav-item {
display: block;
padding: 0 20px;
float: right;
-webkit-transition: color 200ms linear;
-moz-transition: color 200ms linear;
-ms-transition: color 200ms linear;
-o-transition: color 200ms linear;
transition: color 200ms linear;
}
#desktop-nav .nav-item:hover, #desktop-nav .nav-item:active {
opacity: 0.7;
}
/* Mobile */
#mobile-nav {
position: absolute;
top: 55px;
right: 0;
left: 0;
opacity: 0;
visibility: hidden;
-webkit-transition: visibility 0ms linear 200ms, opacity 200ms linear;
-moz-transition: visibility 0ms linear 200ms, opacity 200ms linear;
-ms-transition: visibility 0ms linear 200ms, opacity 200ms linear;
-o-transition: visibility 0ms linear 200ms, opacity 200ms linear;
transition: visibility 0ms linear 200ms, opacity 200ms linear;
}
#mobile-nav .nav-item {
display: block;
width: 100%;
padding-left: 30px;
background: #333;
border-bottom: 1px solid #666;
opacity: 0;
-webkit-transition: background 200ms linear, color 200ms linear;
-moz-transition: background 200ms linear, color 200ms linear;
-ms-transition: background 200ms linear, color 200ms linear;
-o-transition: background 200ms linear, color 200ms linear;
transition: background 200ms linear, color 200ms linear;
}
#mobile-nav .nav-item:hover, #mobile-nav .nav-item:active {
background: #666;
color: white;
}
#mobile-nav .nav-item:last-child {
border-bottom: none;
}
/* Toggles */
.nav-toggle {
position: absolute;
left: -100px;
right: 0;
line-height: 0px;
border: none;
cursor: pointer;
height: 22px;
width: 22px;
margin: 16px 22px;
background-position: center;
background-repeat: no-repeat;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
background-image: url('../images/menu-icon.svg');
background-color: #333;
}
.nav-toggle:hover {
opacity: 0.7;
}
#open-toggle:focus {
left: -100px;
}
#open-toggle:focus ~ #close-toggle {
left: auto;
}
#open-toggle:focus ~ #mobile-nav {
visibility: visible;
opacity: 1;
-webkit-transition-delay: 0s;
-moz-transition-delay: 0s;
-ms-transition-delay: 0s;
-o-transition-delay: 0s;
transition-delay: 0s;
}
#open-toggle:focus ~ #mobile-nav .nav-item {
opacity: 1; /* Avoid initial fade in of content, have to use opacity because using visibility breaks functionality */
}
/* Logo */
#logo {
position: absolute;
padding: 0 20px;
font-size: 21px;
font-weight: bold;
cursor: pointer;
color: #fff
}
#logo:hover {
opacity: 0.7;
}
.header-logo {
font-family: 'Indie Flower', cursive;
font-size: 36px;
padding: 8px;
float: left;
}
.header-notes {
padding: 100px 0;
width: 100%;
color: white;
}
.header-notes div {
margin: auto;
width: 50%;
text-align: center;
font-size: 40px;
}
span.green {
color: #19A3A3;
}
/* PAGE MAIN CONTENT */
.content {
text-align: center;
padding-top: 50px;
}
.content h2 {
color: #19A3A3;
padding: 25px;
}
.content p {
padding: 25px 15%;
}
.hr-background {
background: url(../img/hr-bg.png);
width: 229px;
height: 14px;
margin: auto;
}
.photos {
margin: auto;
margin-top: 30px;
margin-bottom: 40px;
display: inline-block;
width: 70%;
}
.photos ul li {
float: left;
list-style: none;
padding: 1%;
width: 23%;
}
.photos ul li img {
width: 100%;
}
.photos ul li:hover h3 {
color: #19A3A3;
}
.photos a {
text-decoration: none;
color: black;
}
.photos h3 {
padding: 15px 0;
font-size: 16px;
}
.photos p {
font-size: 13px;
padding: 0;
}
.slider {
display: block;
margin: auto;
margin-bottom: 30px;
width: 60px;
}
.slider ul {
height: 8px;
}
.slider ul li {
float: left;
list-style: none;
background: url(../img/slide_point_bg.png) no-repeat;
width: 8px;
height: 8px;
margin-left: 5px;
border-radius: 100%;
}
.slider ul li.active {
background: url(../img/slide_point_active_bg.png) no-repeat;
}
.slider ul li:hover {
box-shadow: 0 0 0.5em black;
}
/* FOOTER */
.footer {
background: #062134;
color: white;
display: table;
font-size: 14px;
}
.footer .column-title {
margin-bottom: 30px;
font-weight: bold;
}
.footer > div {
display: table-row;
}
.footer > div > div {
display: table-cell;
width: 23%;
padding-top: 50px;
padding-bottom: 50px;
}
.footer > div > div:first-child {
padding-left: 5%;
padding-right: 1%;
}
.footer > div > div:nth-child(2) {
padding-left: 1%;
padding-right: 1%;
}
.footer > div > div:nth-child(3) {
padding-left: 1%;
padding-right: 20%;
}
.footer p {
line-height: 200%;
}
.footer input {
display: block;
float: left;
background: #062134;
/*border: 2px solid white;*/
border-top: 2px solid white;
border-right: 0;
border-bottom: 2px solid white;
border-left: 2px solid white;
border-top-left-radius: 5px;
border-bottom-left-radius: 5px;
/*padding: 10px;*/
width: 75%;
color: white;
height: 36px;
text-indent: 10px;
}
::-webkit-input-placeholder {
color: #1F3748;
}
:-moz-placeholder { /* Firefox 18- */
color: #1F3748;
}
::-moz-placeholder { /* Firefox 19+ */
color: #1F3748;
}
:-ms-input-placeholder {
color: #1F3748;
}
.footer button {
float: left;
background: #062134 url(../img/arrow-input-bg.png) 10px 10px no-repeat;
height: 40px;
width: 40px;
height: 40px;
border-top: 2px solid white;
border-right: 2px solid white;
border-bottom: 2px solid white;
border-left: 0;
border-left: 0;
border-top-right-radius: 5px;
border-bottom-right-radius: 5px;
margin-bottom: 30px;
}
/*.row-2 p {
clear: left;
}*/
.footer input:focus {
outline: 0;
background: #4D7EC9;
}
.footer input:hover {
box-shadow: 0 0 0.5em white;
}
.footer button:hover {
background-color: blue;
}
.footer button:focus {
outline: 0;
}
.list-of-resources {
display: table;
}
.list-of-resources > div {
display: table-row;
}
.list-of-resources > div > div {
display: table-cell;
padding: 5px 0;
}
.list-of-resources > div > div:last-child {
padding: 0 0 0 30px;
}
.list-of-resources a {
text-decoration: none;
color: white;
}
.list-of-resources a:hover {
color: tomato;
}
@media screen and (max-width:1000px) {
/* HEADER */
.header-background {
/* height: 300px;*/
padding-top: 0;
}
.header-notes {
padding: 50px 0;
}
.header-notes > div {
width: 70%;
font-size: 35px;
}
.header-background > div:first-child {
top: 0;
}
.header {
background: #232323;
color: #B2B2B2;
width: 100%;
margin: auto;
}
.header-logo {
font-family: 'Indie Flower', cursive;
font-size: 36px;
padding-left: 30px;
float: left;
}
/* nav {
float: initial;
clear: both;
}
nav ul {
list-style: none;
padding: 15px;
}
nav ul li {
display: inline;
padding: 15px;
} */
/* CONTENT */
.photos {
width: 90%;
}
}
@media screen and (max-width:900px) {
.footer > div > div {
display: table-cell;
width: 28%;
padding-top: 50px;
}
.footer > div > div:first-child {
padding-left: 5%;
padding-right: 1%;
}
.footer > div > div:nth-child(2) {
padding-left: 1%;
padding-right: 1%;
}
.footer > div > div:nth-child(3) {
padding-left: 1%;
padding-right: 5%;
}
}
@media screen and (max-width:700px) {
.footer > div > div {
display: block;
float: left;
width: 42%;
}
.footer > div > div:last-child {
clear: both;
padding-left: 5%;
padding-top: 10px;
}
#desktop-nav {
display: none;
}
#open-toggle {
left: auto;
}
}
@media screen and (max-width:600px) {
.photos ul li {
padding: 5%;
width: 40%;
}
.photos ul li:nth-child(3n+3) {
clear: left;
}
.photos h3 {
padding: 15px 0;
font-size: 18px;
}
.photos p {
font-size: 16px;
padding: 0;
}
.footer > div > div {
width: 90%;
}
.footer > div > div:nth-child(2) {
clear: both;
padding-left: 5%;
padding-top: 10px;
}
}
@media screen and (max-width:480px) {
.header-logo {
font-size: 26px;
padding: 8px;
}
.header-notes > div {
width: 80%;
font-size: 26px;
}
nav ul {
list-style: none;
padding: 5px;
}
nav ul li {
display: inline;
padding: 5px;
}
}
<body>
<div class="header-background">
<!-- <div> -->
<div id="nav">
<div id="logo">Site Title</div>
<nav id="desktop-nav">
<a class="nav-item" href="#1">Github</a>
<a class="nav-item" href="#2">About</a>
<a class="nav-item" href="#3">Community</a>
<a class="nav-item" href="#4">Docs</a>
</nav>
<input id="open-toggle" class="nav-toggle" type="text" readonly>
<input id="close-toggle" class="nav-toggle" type="text" readonly>
<nav id="mobile-nav">
<a class="nav-item" href="#4">Docs</a>
<a class="nav-item" href="#3">Community</a>
<a class="nav-item" href="#2">About</a>
<a class="nav-item" href="#1">Github</a>
</nav>
</div>
<!-- </div> -->
<!-- <div class="header-notes">
<div><span class="green">/creative</span> one page template</div>
</div> -->
</div>
/* GENERAL STUFF */
* {
margin: 0;
padding: 0;
}
body {
width: 100%;
font-family: 'Cabin', sans-serif;
}
/*.clear {
clear: both;
}*/
.clear:after {
display: block;
clear: both;
visibility: hidden;
content: "";
height: 0;
}
/* HEADER BLOCK */
.header-background {
padding-top: 50px;
}
.header-background > div:first-child {
width: 100%;
background: #232323;
}
.header {
background: #232323;
color: #B2B2B2;
width: 80%;
margin: auto;
}
.header a {
text-decoration: none;
color: white;
}
.header a:active {
color: #19A3A3;
}
#nav {
position: relative;
display: block;
height: 55px;
line-height: 55px;
width: 100%;
max-width: none;
margin: 0;
background: #333;
z-index: 1;
border-bottom: 1px solid #666;
font-weight: 600;
font-family: helvetica, arial, sans-serif;
font-size: 14px;
}
#nav, #nav * {
-webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
-moz-box-sizing: border-box; /* Firefox, other Gecko */
box-sizing: border-box; /* Opera/IE 8+ */
}
.nav-item {
color: #fff;
text-transform: uppercase;
text-decoration: none;
}
/* Desktop */
#desktop-nav .nav-item {
display: block;
padding: 0 20px;
float: right;
-webkit-transition: color 200ms linear;
-moz-transition: color 200ms linear;
-ms-transition: color 200ms linear;
-o-transition: color 200ms linear;
transition: color 200ms linear;
}
#desktop-nav .nav-item:hover, #desktop-nav .nav-item:active {
opacity: 0.7;
}
/* Mobile */
#mobile-nav {
position: absolute;
top: 55px;
right: 0;
left: 0;
opacity: 0;
visibility: hidden;
-webkit-transition: visibility 0ms linear 200ms, opacity 200ms linear;
-moz-transition: visibility 0ms linear 200ms, opacity 200ms linear;
-ms-transition: visibility 0ms linear 200ms, opacity 200ms linear;
-o-transition: visibility 0ms linear 200ms, opacity 200ms linear;
transition: visibility 0ms linear 200ms, opacity 200ms linear;
}
#mobile-nav .nav-item {
display: block;
width: 100%;
padding-left: 30px;
background: #333;
border-bottom: 1px solid #666;
opacity: 0;
-webkit-transition: background 200ms linear, color 200ms linear;
-moz-transition: background 200ms linear, color 200ms linear;
-ms-transition: background 200ms linear, color 200ms linear;
-o-transition: background 200ms linear, color 200ms linear;
transition: background 200ms linear, color 200ms linear;
}
#mobile-nav .nav-item:hover, #mobile-nav .nav-item:active {
background: #666;
color: white;
}
#mobile-nav .nav-item:last-child {
border-bottom: none;
}
/* Toggles */
.nav-toggle {
position: absolute;
left: -100px;
right: 0;
line-height: 0px;
border: none;
cursor: pointer;
height: 22px;
width: 22px;
margin: 16px 22px;
background-position: center;
background-repeat: no-repeat;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
background-image: url('../images/menu-icon.svg');
background-color: #333;
}
.nav-toggle:hover {
opacity: 0.7;
}
#open-toggle:focus {
left: -100px;
}
#open-toggle:focus ~ #close-toggle {
left: auto;
}
#open-toggle:focus ~ #mobile-nav {
visibility: visible;
opacity: 1;
-webkit-transition-delay: 0s;
-moz-transition-delay: 0s;
-ms-transition-delay: 0s;
-o-transition-delay: 0s;
transition-delay: 0s;
}
#open-toggle:focus ~ #mobile-nav .nav-item {
opacity: 1; /* Avoid initial fade in of content, have to use opacity because using visibility breaks functionality */
}
/* Logo */
#logo {
position: absolute;
padding: 0 20px;
font-size: 21px;
font-weight: bold;
cursor: pointer;
color: #fff
}
#logo:hover {
opacity: 0.7;
}
.header-logo {
font-family: 'Indie Flower', cursive;
font-size: 36px;
padding: 8px;
float: left;
}
.header-notes {
padding: 100px 0;
width: 100%;
color: white;
}
.header-notes div {
margin: auto;
width: 50%;
text-align: center;
font-size: 40px;
}
span.green {
color: #19A3A3;
}
/* PAGE MAIN CONTENT */
.content {
text-align: center;
padding-top: 50px;
}
.content h2 {
color: #19A3A3;
padding: 25px;
}
.content p {
padding: 25px 15%;
}
.hr-background {
background: url(../img/hr-bg.png);
width: 229px;
height: 14px;
margin: auto;
}
.photos {
margin: auto;
margin-top: 30px;
margin-bottom: 40px;
display: inline-block;
width: 70%;
}
.photos ul li {
float: left;
list-style: none;
padding: 1%;
width: 23%;
}
.photos ul li img {
width: 100%;
}
.photos ul li:hover h3 {
color: #19A3A3;
}
.photos a {
text-decoration: none;
color: black;
}
.photos h3 {
padding: 15px 0;
font-size: 16px;
}
.photos p {
font-size: 13px;
padding: 0;
}
.slider {
display: block;
margin: auto;
margin-bottom: 30px;
width: 60px;
}
.slider ul {
height: 8px;
}
.slider ul li {
float: left;
list-style: none;
background: url(../img/slide_point_bg.png) no-repeat;
width: 8px;
height: 8px;
margin-left: 5px;
border-radius: 100%;
}
.slider ul li.active {
background: url(../img/slide_point_active_bg.png) no-repeat;
}
.slider ul li:hover {
box-shadow: 0 0 0.5em black;
}
/* FOOTER */
.footer {
background: #062134;
color: white;
display: table;
font-size: 14px;
}
.footer .column-title {
margin-bottom: 30px;
font-weight: bold;
}
.footer > div {
display: table-row;
}
.footer > div > div {
display: table-cell;
width: 23%;
padding-top: 50px;
padding-bottom: 50px;
}
.footer > div > div:first-child {
padding-left: 5%;
padding-right: 1%;
}
.footer > div > div:nth-child(2) {
padding-left: 1%;
padding-right: 1%;
}
.footer > div > div:nth-child(3) {
padding-left: 1%;
padding-right: 20%;
}
.footer p {
line-height: 200%;
}
.footer input {
display: block;
float: left;
background: #062134;
/*border: 2px solid white;*/
border-top: 2px solid white;
border-right: 0;
border-bottom: 2px solid white;
border-left: 2px solid white;
border-top-left-radius: 5px;
border-bottom-left-radius: 5px;
/*padding: 10px;*/
width: 75%;
color: white;
height: 36px;
text-indent: 10px;
}
::-webkit-input-placeholder {
color: #1F3748;
}
:-moz-placeholder { /* Firefox 18- */
color: #1F3748;
}
::-moz-placeholder { /* Firefox 19+ */
color: #1F3748;
}
:-ms-input-placeholder {
color: #1F3748;
}
.footer button {
float: left;
background: #062134 url(../img/arrow-input-bg.png) 10px 10px no-repeat;
height: 40px;
width: 40px;
height: 40px;
border-top: 2px solid white;
border-right: 2px solid white;
border-bottom: 2px solid white;
border-left: 0;
border-left: 0;
border-top-right-radius: 5px;
border-bottom-right-radius: 5px;
margin-bottom: 30px;
}
/*.row-2 p {
clear: left;
}*/
.footer input:focus {
outline: 0;
background: #4D7EC9;
}
.footer input:hover {
box-shadow: 0 0 0.5em white;
}
.footer button:hover {
background-color: blue;
}
.footer button:focus {
outline: 0;
}
.list-of-resources {
display: table;
}
.list-of-resources > div {
display: table-row;
}
.list-of-resources > div > div {
display: table-cell;
padding: 5px 0;
}
.list-of-resources > div > div:last-child {
padding: 0 0 0 30px;
}
.list-of-resources a {
text-decoration: none;
color: white;
}
.list-of-resources a:hover {
color: tomato;
}
@media screen and (max-width:1000px) {
/* HEADER */
.header-background {
/* height: 300px;*/
padding-top: 0;
}
.header-notes {
padding: 50px 0;
}
.header-notes > div {
width: 70%;
font-size: 35px;
}
.header-background > div:first-child {
top: 0;
}
.header {
background: #232323;
color: #B2B2B2;
width: 100%;
margin: auto;
}
.header-logo {
font-family: 'Indie Flower', cursive;
font-size: 36px;
padding-left: 30px;
float: left;
}
/* nav {
float: initial;
clear: both;
}
nav ul {
list-style: none;
padding: 15px;
}
nav ul li {
display: inline;
padding: 15px;
} */
/* CONTENT */
.photos {
width: 90%;
}
}
@media screen and (max-width:900px) {
.footer > div > div {
display: table-cell;
width: 28%;
padding-top: 50px;
}
.footer > div > div:first-child {
padding-left: 5%;
padding-right: 1%;
}
.footer > div > div:nth-child(2) {
padding-left: 1%;
padding-right: 1%;
}
.footer > div > div:nth-child(3) {
padding-left: 1%;
padding-right: 5%;
}
}
@media screen and (max-width:700px) {
.footer > div > div {
display: block;
float: left;
width: 42%;
}
.footer > div > div:last-child {
clear: both;
padding-left: 5%;
padding-top: 10px;
}
#desktop-nav {
display: none;
}
#open-toggle {
left: auto;
}
}
@media screen and (max-width:600px) {
.photos ul li {
padding: 5%;
width: 40%;
}
.photos ul li:nth-child(3n+3) {
clear: left;
}
.photos h3 {
padding: 15px 0;
font-size: 18px;
}
.photos p {
font-size: 16px;
padding: 0;
}
.footer > div > div {
width: 90%;
}
.footer > div > div:nth-child(2) {
clear: both;
padding-left: 5%;
padding-top: 10px;
}
}
@media screen and (max-width:480px) {
.header-logo {
font-size: 26px;
padding: 8px;
}
.header-notes > div {
width: 80%;
font-size: 26px;
}
nav ul {
list-style: none;
padding: 5px;
}
nav ul li {
display: inline;
padding: 5px;
}
}
#nav {
position:relative;
width:620px;
margin:0 auto;
}
ul#navigation {
margin:0px auto;
position:relative;
float:left;
border-left:1px solid #c4dbe7;
border-right:1px solid #c4dbe7;
}
ul#navigation li {
display:inline;
font-size:12px;
font-weight:bold;
margin:0;
padding:0;
float:left;
position:relative;
border-top:1px solid #c4dbe7;
border-bottom:2px solid #c4dbe7;
}
ul#navigation li a {
padding:10px 25px;
color:#616161;
text-shadow:1px 1px 0px #fff;
text-decoration:none;
display:inline-block;
border-right:1px solid #fff;
border-left:1px solid #C2C2C2;
border-top:1px solid #fff;
background: #f5f5f5;
-webkit-transition:color 0.2s linear, background 0.2s linear;
-moz-transition:color 0.2s linear, background 0.2s linear;
-o-transition:color 0.2s linear, background 0.2s linear;
transition:color 0.2s linear, background 0.2s linear;
}
ul#navigation li a:hover {
background:#f8f8f8;
color:#282828;
}
ul#navigation li:hover > a {
background:#fff;
}
/* Drop-Down Navigation */
ul#navigation li:hover > ul
{
visibility:visible;
opacity:1;
}
ul#navigation ul, ul#navigation ul li ul {
list-style: none;
margin: 0;
padding: 0;
visibility:hidden;
position: absolute;
z-index: 99999;
width:180px;
background:#f8f8f8;
box-shadow:1px 1px 3px #ccc;
opacity:0;
-webkit-transition:opacity 0.2s linear, visibility 0.2s linear;
-moz-transition:opacity 0.2s linear, visibility 0.2s linear;
-o-transition:opacity 0.2s linear, visibility 0.2s linear;
transition:opacity 0.2s linear, visibility 0.2s linear;
}
ul#navigation ul {
top: 43px;
left: 1px;
}
ul#navigation ul li ul {
top: 0;
left: 181px;
}
ul#navigation ul li {
clear:both;
width:100%;
border:0 none;
border-bottom:1px solid #c9c9c9;
}
ul#navigation ul li a {
background:none;
padding:7px 15px;
color:#616161;
text-shadow:1px 1px 0px #fff;
text-decoration:none;
display:inline-block;
border:0 none;
float:left;
clear:both;
width:150px;
}
ul#navigation li a.first {
border-left: 0 none;
}
ul#navigation li a.last {
border-right: 0 none;
}
但是我失败了。我必须在哪里添加此字段才能到达此屏幕？？？居中对齐的基本经验法则是指定宽度和边距，就像这样
.my-class {
width: 600px;
margin: auto;
}
我希望这可能有助于解决您的问题
查看下面的链接
请提供JSFIDLE或demo…您真的需要所有这些代码来显示您的问题吗？请缩小到最小的必要代码。请提供JSOFDLE，只需要必要的代码编辑了JS FieldMobile，视图是完美的。我在桌面视图中有问题。我想在中间设置导航，需要导航的宽度与正文的内容相同。请简要说明发生了什么变化。
$('.handle').on('click', function(){
$('nav ul').toggleClass('showing');
});
.navbar .navbar-nav {
display: inline-block;
float: none;
}
.navbar .navbar-collapse {
text-align: center;
}