Reactjs 如何使导航栏与页面的其余部分重叠？

当我向下滚动时，我希望我的导航栏是固定的，并保持在页面其余部分的上方，但每当我添加“position:fixed；”函数在css页面上消失

下面是JS和Css中导航栏的代码

import Logo from '../../Images/mmt-white.png';
import './Navbar.css';

const Navbar = props => (

    <header className="Navbar">
        <nav className="Navbar__navigation">
            <div></div>
            <div className='Navbar__logo'><img src={Logo}/></div>
            <div className='spacer '/>
            <div className="Navbar_navigation-items">
                <ul>
                    <li><a  href="/">Home</a></li>
                    <li><a  href="/">Servicos</a></li>
                    <li><a  href="/">Depoimentos</a></li>
                    <li><a  href="/">Começando</a></li>
                    <li><a  href="/">Contacte-nos</a></li>    
                </ul>

            </div>
            <div className="Navbar_navigation_items_acessar">
                <ul>
                    <li><a href="/">Acessar</a></li>
                </ul>

            </div>
            
        </nav>
       
    </header>

);

export default Navbar;

---

您可能希望将以下内容添加到

NavBar.css

文件中的

NavBar

类中，以添加如下位置属性：

left: 0;
position: fixed;
top: 0;
z-index: 1; // increase this value if you have other elements at varying levels of elevation

或者，您可能希望在

NavBar.css

文件中的

NavBar

类中添加以下内容，而不是

position:fixed

（这取决于您正在寻找的行为）：

---

也请发布你的CSS。我尝试了两种方法，但仍然不起作用；（我会上传我的CSS

className

你正在使用的是

NavBar

，但我看不出这个类是你的CSS文件。你是说

sticky

？别担心这是我的错误，我必须在我的CSS中定位…这就是它不起作用的原因！

.NavbarItems {
  background: linear-gradient(90deg,rgb(49,56,64)0%,rgba(49, 56, 64, 1) 100%);
  height: 10vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1,2rem;
  left: 0;
  position: fixed;
  top: 0;
  z-index: 1; 
  position: relative;

}
.sticky {
  position: fixed;
  top: 0;
  width: 100%;
}

.navbar-logo{
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(15%, 10%);

}

.fa-react{
  margin-left: 0.5rem;
  font-size: 1,6rem;

}


.nav-menu {
  display: grid;
  grid-template-columns: repeat(6, auto);
  grid-gap: 10px;
  transform: translate(8%, 0%);
  list-style: none;
  margin-left: 10vh;
  text-align: center;
  width: 80vw;
  justify-content: end;
  padding-left: 10vh;
  margin-right: 1rem;
  font-size: 10px;
}

.nav-links {
  color:#edf0f1;
  margin-top: 2rem;
  padding-right: 2rem;
  padding: 0;
  text-decoration: none;
  font-size: 22px;
  font-family: monospace;
  text-transform: uppercase;

}

.nav-links:hover{
  border-radius: 4px;
  transition: all 0.2s ease0;
  color: #0088a9;
  
  
}

.fa-bars{
  color: #ffffff;

}


button{
  margin-left: 10vh;
  right: 0;
  padding: 9px 25px;
  background-color: rgba(0, 136, 169, 1);
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease 0s;
  font-family: "Montserrat", sans-serif;
  font-weight: 500;
  color: #edf0f1;
  font-size: 17px;
  text-decoration: none;
}
.menu-icon{
  display: none;
}

.nav-links-mobile{
  color: transparent;
}

left: 0;
position: fixed;
top: 0;
z-index: 1; // increase this value if you have other elements at varying levels of elevation

position: sticky;
top: 0; // vertical position you'd like the element to stick to
z-index: 1; // increase this value if you have other elements at varying levels of elevation