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我希望我的main-content div在我的导航栏下移动，该屏幕在屏幕上重新调整为水平导航栏。当导航在屏幕上变化时，在另一个屏幕上移动div
我认为一些简单的像这样的工作：
@media screen and (max-width: 540px) {
#main-content{
display:block;
width:100%;
}
}
但两者的div是并排显示。如何让我的main-content在我的导航栏下变为水平栏时立即移动？
这是我目前的做法证明了问题：
.site-wrapper {
height: 100%;
min-height: 100%;
display: flex;
}
/* NAVIGATION */
.nav-container {
border-right: 1px solid #E4E2E2;
height: 100%;
width: 200px;
background-color: #f4f3f3;
}
.logo-holder {
text-align: center;
}
.nav {
text-align: justify;
}
.nav-link {
display: block;
text-align: left;
color: #333;
text-decoration: none;
margin-left: 0px;
padding-left: 15px;
}
.nav-link:hover {
background-color: #333;
color: #f4f3f3;
}
.nav ul {
width: 100%;
padding: 0px;
}
.nav ul li {
margin-left: 5px;
list-style-type: none;
height: 25px;
}
.nav ul li a {
text-align: left;
padding: 5px;
color: #333;
text-decoration: none;
margin-left: 15px;
}
.nav li:hover a {
color: #f4f3f3;
}
/* MAIN CONTENT */
#main-content {
float: left;
margin: 10px;
border: 1px solid black;
width: 80%;
height: 500px;
}
@media screen and (max-width: 540px) {
#main-content {
display: block;
width: 100%;
}
}
.reg-div {
border: 1px solid red;
width: 80%;
}
.reg-div ul li {
list-style: none;
text-decoration: none;
color: #333;
}
/* MEDIA QUERIES */
@media screen and (max-width: 540px) {
.nav-container {
width: 100%;
height: 100px;
background-color: #f4f3f3;
border-bottom: 0.5px solid #f4f3f3;
}
.nav-link {
padding: 10px;
}
.logo-holder {
overflow: hidden;
display: block;
width: 40%;
}
.nav-container nav ul {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.logo-holder {
text-align: left;
}
#navigation-div {
background-color: #f4f3f3;
margin-top: 0;
}
}<div class="site-wrapper">
<!-- NAV-CONTAINER - LEFT OF PAGE -->
<div class="nav-container">
<div class="logo-holder">
<img class="user-select-none" width="150px" height="150px" src="" alt="logo here" />
</div>
<div id="navigation-div">
<nav class="nav">
<ul class="nav-ul">
<a class="nav-link active" href="">
<li>test 1</li>
</a>
<a class="nav-link " href="">
<li>test 2</li>
</a>
<a class="nav-link" href="">
<li>test 3</li>
</a>
</ul>
</nav>
</div>
</div>
<!-- NAV-CONTAINER END -->
<div id="main-content">
<div class="reg-div">
<ul>
<li><a href="">Login</a> | <a href="">Sign Up</a></li>
</ul>
</div>
<!-- MAIN CONTENT END -->
</div>JS提琴：https://jsfiddle.net/gtLhje4z/