JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="css/style.css">
    <link rel="icon" href="img/icon.png">
    <title>huy</title>
</head>
<body>
    <div id="page-wrapper">
        <div id="header" class="block"></div>
        <div id="sidebar" class="block"></div>
        <div id="content" class="block"></div>
        <div id="footer" class="block"></div>
    </div>
</body>
</html>

CSS

html {
    margin: 0 0 0 0;
}
 
body {
    margin: 0 0 0 0;
    background-image: url(../img/bg.jpg);
    background-size: 100%;
}
 
.block {
    background-color: #0a0a0a;
    opacity: 0.7;
    box-shadow: 0px 0px 5px 5px #1f1f1f;
    margin: 10px 10px 10px 10px;

}
 
 
#page-wrapper {
    width: 1090px;
    height: 100%;
}
 
#header {
    width: 800px;
    height: 100px;
    display: block;
    float: left;
}
 
#sidebar {
    width: 250px;
    height: 300px;
    display: block;
    float: right;
}
 
#content {
    width: 800px;
    min-height: 600px;
    display: block;
    float: left;
}
 
#footer {
    width: 800px;
    height: 70px;
    display: block;
    float: left;
}