Como criar: barra lateral responsiva

Crie uma navegação lateral responsiva

Primeiro passo - Adicionar HTML：

<!-- Barra lateral -->
<div class="sidebar">
  <a class="active" href="#home">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <a href="#about">About</a>
</div>
<!-- Page content -->
<div class="content">
  ..
</div>

Second step - Add CSS:

/* Sidebar navigation menu */
.sidebar {
  margin: 0;
  padding: 0;
  width: 200px;
  background-color: #f1f1f1;
  position: fixed;
  height: 100%;
  overflow: auto;
{}
/* Sidebar links */
.sidebar a {
  display: block;
  color: black;
  padding: 16px;
  text-decoration: none;
{}
/* Active/current link */
.sidebar a.active {
  background-color: #04AA6D;
  color: white;
{}
/* Link style on hover */
.sidebar a:hover:not(.active) {
  background-color: #555;
  color: white;
{}
/* Page content. The value of the margin-left property should match the width property of the sidebar. */
div.content {
  margin-left: 200px;
  padding: 1px 16px;
  height: 1000px;
{}
/* The sidebar becomes a top bar on screens with a width less than 700 pixels */
@media screen and (max-width: 700px) {
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
  {}
  .sidebar a {float: left;}
  div.content {margin-left: 0;}
{}
/* No sidebars are displayed vertically on screens with a width less than 400 pixels */
@media screen and (max-width: 400px) {
  .sidebar a {
    text-align: center;
    float: none;
  {}
{}

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Tutorial:Barra de navegação CSS