Untitled

#header, #footer {
    height: 10%;
    width: 100%;
    background-color: gray;
}
.left, .right {
    display: inline-block;
    height: 80%;
    width: 10%;
    background-color: yellow;
}
.right {
    float: right;
}
#footer {
    clear: both;
}
.center{
    margin: 0;
    background-color: red;
    height: 79.7%;
    width: 79.7%;
    display: inline-block;
    border: 1px solid red;
}

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<!DOCTYPE html>
<html lang="en">
<head>
    <title>WRD Only</title>
    <script src="mainJS.js"></script>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div style="width: 100%; height: 100%; position: absolute">
    <div id="header">header</div>
    <div class="left">aa</div>
    <div class="center"></div>
    <div class="right">bb</div>
    <div id="footer">footer</div>
    </div>
</body>
</html>