Html 工作。在我的另一段代码中，它们彼此之间的距离仍然很小，但我会弄明白这一点。再次感谢你，伙计。 @media(max-width:575px){ /*APPLY WHATEVER STYLING YOU WANT TO HAPPEN WHEN THE SCR

工作。在我的另一段代码中，它们彼此之间的距离仍然很小，但我会弄明白这一点。再次感谢你，伙计。

@media(max-width:575px){
/*APPLY WHATEVER STYLING YOU WANT TO HAPPEN WHEN THE SCREEN IS RESIZED TO 575PX*/

.yourClassName{
  width:whatEverWidthYouWant
}

}

<div class="form-container">
 
 <form>
   
   <div class="form-group1 form-group">
     <label>First name</label>
     <input>
   </div>
   
   <div class="form-group2 form-group">
     <label>Last name</label>
     <input>
   </div>

   <label>E-mail</label>
   <input id="email">


   <label class="date-of-birth">Date of Birth</label>
   
   <div class="mail-padding">
     <select id="dob-day" name="dob">
       <option value="1">1</option>
       <option value="2">2</option>
     </select>

     <select id="dob-month" name="dob">
       <option value="jan">Jan</option>
       <option value="feb">Feb</option>
     </select>
   </div>
   
 </form> </div>

    body {
  background-color: #000;
  color: white;
  font-size: 25px;
  text-align: center;
}

form {
  margin-top: 15%;
}

label {
  display: block;
  margin-top: 10px;
  font-size: 60%;
}

/* <label> tag for 'Date of Birth' */
.date-of-birth {
  margin-bottom: 25px;
  margin-top: 20px;
  text-align: center;
}

/* styles the 'First name', 'Last name' and 'E-mail' boxes */
input {
  width: 94%;
  height: 50px;
  background-color: #000;
  border: 2px solid #fff;
  margin-top: 3px;
}

/* The 'Day' and 'Month' dropdown boxes */
select {
  width: 47%;
  height: 50px;
  background-color: transparent;
  color: #fff;
  border: 2px solid #fff;
  margin-top: -8px;
  margin-bottom: 20px;
  padding-left: 15px;
}

.form-group {
  display: inline-block;
  width: 47.2%;
  margin-bottom: 10px;
}

/* Pushes both boxes to the sides */
.form-group1 {
  margin-right: 8px;
}

@media only screen and (min-width: 575px) {
  .form-container {
    display: flex;
    justify-content: center;
  }
  
  form {
    flex: 1;
    max-width: 575px;
  }
}

@media only screen and (min-width: 575px){
     .mail-padding {
        padding: 20px 150px 0 150px;
        max-width: 575px;
        box-sizing: border-box;
        margin-left: auto;
        margin-right: auto;
     }
}