Background color does not show up when scrolling to the right

Tags: html,css,scroll

Problem :

I have the following simple HTML and CSS:

    <div style="width: 970px;">Text area</div>
    <div style="height: 20px; background-color:gray; width: 100%; "></div>

I load this page in a browser. If the width of the browser is 400px (just an example), then I see a horizontal scroll bar in the browser screen bottom. If I move the scroll bar to the right, I can see that the background of the second div does not extend to the right.

I hope that the background color of the second div can extend from browser's left edge to the right edge (no matter what the width of the browser is).

How can I fix this?


Solution :

Whenever an element's explicitly set width is larger than the width of the body, the element overflows the body's boundaries. In other words, the browser will not adjust the width of the body, thereby restructuring an entire page layout, because one element spills over.

One solution is to make the div that follows the first div overflow as well.

Here's HTML:

    <div>Text area</div>


body > div:first-of-type {
    width: 970px;
    outline: 1px solid red;

body > div:last-of-type {
    width: 100%;
    height: 20px;
    background-color: gray;

@media screen and (max-width: 970px) {
    body > div:nth-of-type(2) {
        width: 970px;    

And, here's a fiddle:

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