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Table of Contents
1. Basic HTML Structure
2. Desktop Layout with Flexbox
3. Make It Responsive with Media Queries
4. Optional: Add a Hidden Sidebar with Toggle (Mobile-Friendly)
Key Tips
Home Web Front-end CSS Tutorial How to create a responsive sidebar with CSS?

How to create a responsive sidebar with CSS?

Aug 02, 2025 am 04:23 AM
css 響應式側(cè)邊欄

Use HTML and CSS to create responsive sidebars; 2. The desktop side is laid sidebars with content through Flexbox; 3. The mobile side sets the sidebars to vertical stacking or hidden sliding display through media queries; 4. Optionally, the mobile menu switch can be switched through the checkbox hack; 5. Key tips include using modern layout technology, multi-device testing and ensuring accessibility, and ultimately implementing an adaptive sidebar design without a framework.

How to create a responsive sidebar with CSS?

Creating a responsive sidebar with CSS is straightforward once you understand the layout techniques and media queries. The goal is to have a sidebar that works well on both desktop and mobile devices—either by collapse, sliding in/out, or stacking below content when screen space is limited.

How to create a responsive sidebar with CSS?

Here's how to build a clean, responsive sidebar using just HTML and CSS.


1. Basic HTML Structure

Start with a simple layout:

How to create a responsive sidebar with CSS?
 <div class="container">
  <nav class="sidebar">
    <ul>
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Services</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
  </nav>

  <main class="content">
    <h1>Main Content</h1>
    <p>This is the main page content.</p>
  </main>
</div>

2. Desktop Layout with Flexbox

Use Flexbox to place the sidebar and content side by side on larger screens.

 .container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 250px;
  background-color: #333;
  color: white;
  padding: 20px;
}

.sidebar ul {
  list-style: none;
  padding: 0;
}

.sidebar ul li {
  margin-bottom: 15px;
}

.sidebar a {
  color: white;
  text-decoration: none;
}

.content {
  flex: 1;
  padding: 20px;
  background-color: #f4f4f4;
}

On desktop, the sidebar stays fixed on the left, and the content fills the rest.

How to create a responsive sidebar with CSS?

3. Make It Responsive with Media Queries

On smaller screens, stack the sidebar above or below the content, or hide it with a toggle (we'll cover a simple stack version here).

 @media (max-width: 768px) {
  .container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    padding: 10px;
  }

  .sidebar ul li {
    margin-bottom: 10px;
  }

  .content {
    padding: 15px;
  }
}

Now, on mobile, the sidebar appears above the content and take full width.


4. Optional: Add a Hidden Sidebar with Toggle (Mobile-Friendly)

For a cleaner mobile experience, you can hide the sidebar and show it only when needed using a checkbox hack or JavaScript. Here's a pure CSS version using a checkbox:

Updated HTML:

 <input type="checkbox" id="menu-toggle" class="menu-toggle">
<label for="menu-toggle" class="menu-btn">? Menu</label>

<div class="container">
  <nav class="sidebar">
    <ul>
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Services</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
  </nav>

  <main class="content">
    <h1>Main Content</h1>
    <p>Click the menu button to toggle the sidebar.</p>
  </main>
</div>

Additional CSS:

 .menu-toggle {
  display: none;
}

.menu-btn {
  display: none;
  background: #333;
  color: white;
  padding: 10px 15px;
  cursor: pointer;
  text-align: center;
  font-size: 18px;
}

@media (max-width: 768px) {
  .menu-btn {
    display: block;
  }

  .sidebar {
    position: fixed;
    left: -250px;
    top: 0;
    height: 100%;
    width: 250px;
    transition: left 0.3s ease;
  }

  .menu-toggle:checked .menu-btn .container .sidebar {
    left: 0;
  }

  .content {
    margin-left: 0;
  }
}

Now, on mobile, the sidebar is hidden off-screen and slides in when the user clicks the "? Menu" button.


Key Tips

  • Use Flexbox or CSS Grid for modern, flexible layouts.
  • Always test on multiple screen sizes.
  • Consider accessibility: ensure the toggle button is keyboard-navigable.
  • For production, you might enhance with JavaScript for smoother animations or better UX.

That's it. You now have a responsive sidebar that adapts to different devices using only HTML and CSS. Doesn't need a framework, and it's easy to customize.

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