How to fill margin space with divs and give it styles?

Tags: html,css,responsive-design,width

Problem :

For my Website I’d like to have a banner on my header (with all things like logo, menu), which covers 100% of my screen width.

Fine and easy so far.

But now, after a certain screen resolution that banner should stop filling 100%, so I just gave a max-width: 1000px; and a margin: 0 auto; for centering my banner.

The Problem:

In this example, when the screen width exceeds 1000px I will get a margin left and margin right depending on screen width minus the 1000px.

I want each of that margins to have a gradient color or any other styles which other people might want to have.

For this I created a structure (below) which is missing the magic code that I don’t know about or maybe it even needs a complete different solution.

The basis of my structure / code are 3 divs aligned in one row with my banner in the center.

The point where I don’t come any further is how to give the "margins / fill ups” widths matching the remaining space.

Example structure:


<div class="container">
    <div class="left"></div>
    <div class="right"></div>
    <div class="center"></div>


.container {
    width: 100%;
    height: 200px;
.center {
    width: 100%;
    /*below breakpoint 1000px*/

    max-width: 1000px;
    /*above breakpoint 1000px*/

    height: 200px;
    background: green;
    margin: 0 auto;
/*getting rid of the "fill ups" below breakpoint 1000px"*/

@media screen (max-width: 1000px) {
    .left {
        width: 0px;
        height: 0px;
    .right {
        width: 0px;
        height: 0px;
/*generating "fill ups" for remaining space between screen border and "center" (left and right)*/

@media screen (min-width: 1001px) {
    .left {
        width: 200px;
        /* width:50%; would like to have 50% of the remaining space (left)*/

        height: 200px;
        background: red;
        float: left;
    .right {
        width: 200px;
        /* width:50%; would like to have 50% of the remaining space (right)*/

        height: 200px;
        background: blue;
        float: right;

Solution :

You can use JS or jQuery for this.

Simply calculate the difference between the width of the .center <div> and the widow width, and then divide that by two to get equal ones on both sides.


$(".left, .right").css({width: ($(window).width - $(".center").width()) / 2});

Actually, I guess you could do this with CSS's calc() as well, but this is slightly less dynamic because you have to input the width of the .center <div> (1000px in your case):


.left, .right {
    width: calc((100% - 1000px) / 2);

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