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Matthew James Taylor Matthew James Taylor

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Left Sidebar Responsive 2-Column Layout (CSS Grid, Flexbox Versions)

15 Feb 2022 — Updated 27 Mar 2023

Responsive left sidebar 2-column layout

Table of contents

What Is The "Left Sidebar" Website Layout?

The left sidebar layout is a design with a vertical panel on the left side (called a sidebar) that typically contains a navigation menu, icons, buttons, or other content, and a large right column for the main content. A header and footer are often added to the two-column design.

In a responsive left sidebar layout on mobile devices, the header, main content, sidebar, and footer are stacked vertically in a single column.

In this article, I will show how to build the responsive left sidebar layout using six different methods; CSS grid, flexbox, Responsive Attributes, Responsive Columns, floated blocks, and tables. Which method you choose will depend on your browser compatibility requirements.

Left Sidebar Responsive 3-Column Layout (CSS Grid)

To create the left sidebar layout with CSS grid, we name our grid areas, assign each column to its correct area, then change the layout of grid areas at each breakpoint.

Live CSS grid demo

Header
Main content
Left sidebar
Footer

Semantic HTML5 markup

I'm using HTML tags that make the most sense for each part of the layout but you can use whatever elements make the most sense for your situation.

I recommend custom elements instead of divs. See why they're so much better in my article: Replace Divs With Custom Elements For Superior Markup.

<div class="left-sidebar-grid">
    <header class="header">Header</header>
    <main class="main-content">Main content</main>
    <section class="left-sidebar">Left sidebar</section>
    <footer class="footer">Footer</footer>
</div>

I'm using classes above, but would ID's be better? See this article for the answer: ID vs Class: Which CSS Selector Should You Use?.

The CSS

/* grid container */
.left-sidebar-grid {
    display:grid;
    grid-template-areas:
        'header'
        'main-content'
        'left-sidebar'
        'footer';
}

/* general column padding */
.left-sidebar-grid > * {
    padding:1rem;
}

/* assign columns to grid areas */
.left-sidebar-grid > .header {
    grid-area:header;
    background:#f97171;
}
.left-sidebar-grid > .main-content {
    grid-area:main-content;
    background:#fff;
}
.left-sidebar-grid > .left-sidebar {
    grid-area:left-sidebar;
    background:#f5d55f;
}
.left-sidebar-grid > .right-sidebar {
    grid-area:right-sidebar;
    background:#c5ed77;
}
.left-sidebar-grid > .footer {
    grid-area:footer;
    background:#72c2f1;
}

/* tablet breakpoint */
@media (min-width:768px) {
    .left-sidebar-grid {
        grid-template-columns:repeat(3, 1fr);
        grid-template-areas:
            'header header header'
            'left-sidebar main-content main-content'
            'footer footer footer';
    }
}

Layout features

Want a bottom footer?

Push your footer to the bottom of the page when you have minimal content with this easy upgrade:

CSS grid browser support

CSS grid has over 96% browser support so it's acceptable to use in production environments (source).

Add responsive font size

Use my special formula to make your font size respond to screen size just like your layout:

html {
    font-size: calc(15px + 0.390625vw);
}

See my article for details: Responsive Font Size (Optimal Text at Every Breakpoint).

Left Sidebar Responsive 3-Column Layout (Flexbox)

To create the left sidebar layout with flexbox, we wrap our columns into three lines and adjust the width of each column at the different breakpoints. We also redefine the order of each column so the main content comes before the sidebar in the HTML source of the page.

Live flexbox demo

Header
Main content
Left sidebar
Footer

Semantic HTML5 markup

I'm using HTML tags that make the most sense for each part of the layout but you can use whatever elements make the most sense for your situation.

I recommend trying custom tags instead of divs. But before using them, read my article first: Custom HTML Tags (18 Things To Know Before Using Them).

<div class="left-sidebar-flexbox">
    <header class="header">Header</header>
    <main class="main-content">Main content</main>
    <section class="left-sidebar">Left sidebar</section>
    <footer class="footer">Footer</footer>
</div>

The CSS

/* flexbox container */
.left-sidebar-flexbox {
    display:flex;
    flex-wrap:wrap;
}

/* columns (mobile) */
.left-sidebar-flexbox > * {
    width:100%;
    padding:1rem;
}

/* background colors */
.left-sidebar-flexbox > .header {background:#f97171}
.left-sidebar-flexbox > .main-content {background:#fff}
.left-sidebar-flexbox > .left-sidebar {background:#f5d55f}
.left-sidebar-flexbox > .footer {background:#72c2f1}

/* tablet breakpoint */
@media (min-width:768px) {
    .left-sidebar-flexbox > .header {
        order:-2; /* header first */
    }
    .left-sidebar-flexbox > .left-sidebar {
        /* left sidebar before main content */
        order:-1;
        width:calc(100% / 3);
    }
    .left-sidebar-flexbox > .main-content {
        width:calc(100% / 3 * 2);
    }
}

Layout features

Add responsive padding

Use my special formula padding:calc(8px + 1.5625vw); to make your whitespace respond to screen size! See my article for details: Responsive Padding, Margin & Gutters With CSS Calc.

Flexbox browser support

Flexbox has over 98% browser support so it's more than acceptable to use in production environments (source).

Left Sidebar 3-Column Layout (Responsive Attributes)

Responsive Attributes is a CSS Grid-based layout system that I developed, it allows anyone to build advanced responsive layouts with just simple HTML.

See my Responsive Attributes documentation to see how easy and powerful it is to use.

Live Responsive Attributes demo

Header
Main content
Left sidebar
Footer

HTML markup with data-attribute breakpoints

Responsive Attributes works by adding simple data-attributes to any HTML element to define grid-based columns for each breakpoint.

Here's how easy it is to create the left sidebar layout:

<main data-sm="1column" data-md="3column">
    <header data-sm="pad" data-md="colspan3 order1">
        Header
    </header>
    <article data-sm="pad row" data-md="colspan2 order3">
        Main content
    </article>
    <section data-sm="pad" data-md="order2">
        Left sidebar
    </section>
    <footer data-sm="pad" data-md="colspan3">
        Footer
    </footer>
</main>

No CSS required!

All the structure and responsive styles of Responsive Attributes are handled by a single tiny CSS file that's less than 1kb! It's so easy to include it in any project.

Download Responsive Attributes and start experimenting.

Layout features

Responsive Attributes browser support

Responsive Attributes uses CSS grid under the hood. Grid has over 96% browser support so it's acceptable for use in production environments (source).

Left Sidebar 3-Column Layout (Responsive Columns)

Responsive Columns is a layout system that I developed where advanced responsive layouts can be coded with custom HTML tags and no extra CSS is required.

See my Responsive Columns documentation to see how quick and powerful it is to use.

Live Responsive Columns demo

Header Main content Left sidebar Footer

HTML markup with custom elements

By default, Responsive Columns works with tiny custom elements and attributes to define any responsive layout.

<r-c join>
    <c1-1 md1>Header</c1-1>
    <c1-1 md2-3>Main content</c1-1>
    <c1-1 md1-3 md2>Left sidebar</c1-1>
    <c1-1>Footer</c1-1>
</r-c>

Optional semantic HTML5 markup

You can also use Responsive Columns with semantic HTML elements by adding data-attributes to specify your layout.

<main data-r-c data-join>
    <header data-md1>Header</header>
    <article data-md2-3>Main content</article>
    <section data-md1-3 data-md2>Left sidebar</section>
    <footer>Footer</footer>
</main>

No CSS required!

All the structure and responsive styles of Responsive Columns are handled by a single tiny CSS file that is easy to include in any project.

Download Responsive Columns and start experimenting.

Layout features

Responsive Columns browser support

Responsive Columns uses flexbox under the hood. Flexbox has over 98% browser support so it's more than acceptable to use in production environments (source).

Left Sidebar Responsive 3-Column Layout (Floated Blocks)

We can create the left sidebar layout with only floated blocks by nesting a set of offset containers to create the columns.

Live floated blocks demo

Header
Main content
Left sidebar
Footer

Semantic HTML5 markup

I'm using HTML tags that make the most sense for each part of the layout but you can use whatever elements make the most sense for your situation.

<div class="left-sidebar-floated-blocks">
    <div class="header">Header</div>
    <div class="main-wrap">
        <div class="left-wrap">
            <div class="main-content">Main content</div>
            <div class="left-sidebar">Left sidebar</div>
        </div>
    </div>
    <div class="footer">Footer</div>
</div>

The CSS

/* set correct box model */
.left-sidebar-floated-blocks * {
    box-sizing:border-box;
}

/* floated container */
.left-sidebar-floated-blocks {
    overflow:hidden;
}
/* stacked columns on mobile */
.left-sidebar-floated-blocks .header {
    padding:1rem;
    background:#f97171;
}
.left-sidebar-floated-blocks .main-content {
    padding:1rem;
    background:#fff;
}
.left-sidebar-floated-blocks .left-sidebar {
    padding:1rem;
    background:#f5d55f;
}
.left-sidebar-floated-blocks .footer {
    padding:1rem;
    background:#72c2f1;
}

/* tablet breakpoint */
@media (min-width:768px) {
    .left-sidebar-floated-blocks .main-wrap {
        background:#fff;
        float:left;
        width:100%;
    }
    .left-sidebar-floated-blocks .left-wrap {
        position:relative;
        right:calc(100%/3*2);
        background:#f5d55f;
        float:left;
        width:100%;
    }
    .left-sidebar-floated-blocks .main-content {
        width:calc(100%/3*2);
        position:relative;
        left:calc(100%/3*2);
        background:none;
        float:right;
    }
    .left-sidebar-floated-blocks .left-sidebar {
        width:calc(100%/3);
        position:relative;
        left:calc(100%/3*2);
        float:left;
    }
    .left-sidebar-floated-blocks .footer {
        clear:both;
    }
}

Do you know how HTML and CSS go together? See my beginner guide: How to add CSS to HTML (With Link, Embed, Import, and Inline styles).

Layout features

Browser support

The floated boxes' left sidebar layout requires the box-sizing:border-box CSS property, this has over 99% browser support! (source)

Need to support even older browsers? 🧐

If you need to achieve 3 equal-height columns in old browsers (back to IE 5.5) that don't support box-sizing:border-box, you can use my nested equal-height columns method, here is an example of a 3 column layout with offsets instead of padding.

Left Sidebar Static 2-Column Layout (Tables)

To create the left sidebar layout with tables we lose the responsive functionality but we gain browser support.

Sometimes tables are still necessary, for example, in HTML emails.

Live table layout demo

Header
Left sidebar Main content
Footer

Table markup

When using tables for layout you don't require <thead> or <tbody> containers.

<table class="left-sidebar-tables">
    <tr>
        <td colspan="2" class="header">Header</td>
    </tr>
    <tr>
        <td class="left-sidebar">Left sidebar</td>
        <td class="main-content">Main content</td>
    </tr>
        <td colspan="2" class="footer">Footer</td>
    </tr>
</table>

The CSS

If you're using this table-based layout for an HTML email you may need to inline your styles to make them work in all email clients, see how to inline CSS.

/* table container */
.left-sidebar-tables {
    width:100%;
    border:0;
    border-collapse:collapse;
}

/* table cells */
.left-sidebar-tables .header {
    padding:16px;
    background:#f97171;
}
.left-sidebar-tables .left-sidebar {
    padding:16px;
    width:33.33333%;
    background:#f5d55f;
}
.left-sidebar-tables .main-content {
    padding:16px;
    width:66.66666%;
    background:#fff;
}
.left-sidebar-tables .footer {
    padding:16px;
    background:#72c2f1;
}

Layout features

Browser support for table layouts

Table layouts have over 99% browser support plus it's the only option for HTML emails.

Compatible addons

The responsive layouts in this article are fully compatible with the following:

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