CSS Responsive Sidebar - Guide

A responsive sidebar is a crucial element of modern applications. On desktop screens, it occupies a fixed position on the side, providing quick access to navigation, whereas on smaller screens, it relocates to the top or hides into a menu to save space.

EXAMPLE

                        <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Responsive Sidebar</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="style.css">
    <script src="script.js" defer></script>
</head>
<body>
    <div class="responsive-sidebar">
        <div class="searchBox">
            <input type="text" placeholder="Search..." aria-label="Search">
        </div>
        <a href="#">HOME</a>
        <a href="#">PRODUCTS</a>
        <a href="#">SERVICES</a>
        <a href="#">PORTFOLIO</a>
        <a href="#">CONTACT</a>
    </div>
    
    <div class="responsive-sidebar-container">
        <h1>Page Content</h1>
        <p>The sidebar on the left is fixed, while the content on the right dynamically adapts.</p>
        <p>On mobile devices (below 700px), the sidebar shifts to the top.</p>
    </div>
</body>
</html>
        
                    

                        * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
}

/* sidebar - fixed width on desktop */
.responsive-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 200px;
    height: 100%;
    background-color: #f1f1f1;
    overflow-x: hidden;
    overflow-y: auto;
    z-index: 10;
    border-right: 1px solid #ddd;
    display: flex;
    flex-direction: column; /* Elements stack vertically on desktop */
}

.responsive-sidebar a {
    display: block;
    padding: 15px;
    color: #333;
    text-decoration: none;
    font-size: 18px;
    transition: 0.3s;
    -webkit-text-fill-color: #333333;
}

.responsive-sidebar a:hover {
    background-color: #ddd;
    color: #f00b06;
    -webkit-text-fill-color: #f00b06;
}

.searchBox {
    padding: 15px;
}

.searchBox input[type=text] {
    width: 100%;
    padding: 8px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
    outline: none;
}

/* Content shifts to accommodate the sidebar width */
.responsive-sidebar-container {
    margin-left: 200px;
    padding: 20px;
}

/* Adjustments for tablets and large phones (below 700px) */
@media screen and (max-width: 700px) {
    .responsive-sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid #ddd;
        flex-direction: row; /* Elements align horizontally in a row */
        flex-wrap: wrap;     /* Allows the search box to wrap onto its own line if space runs out */
        align-items: center;
    }

    .responsive-sidebar a {
        font-size: 16px;
        padding: 12px 15px;
    }

    .searchBox {
        padding: 10px 15px;
        width: 100%; /* Search box takes full width at the top */
        order: -1;   /* Forces the search box to remain in the first position */
    }

    .responsive-sidebar-container {
        margin-left: 0;
    }
}

/* Adjustments for narrow mobile devices (below 480px) */
@media screen and (max-width: 480px) {
    .responsive-sidebar {
        flex-direction: column; /* Elements revert back to a vertical column layout */
        align-items: stretch;
    }

    .responsive-sidebar a {
        text-align: center;
        border-bottom: 1px solid #eee;
    }

    .responsive-sidebar a:last-child {
        border-bottom: none;
    }
}
        
                    

RESULT