<style>
    html, body {
        margin: 0;
        padding: 0;
    }
    div { 
        position: absolute;
        width: 100px;
        height: 100px;
    }
</style>
<body>
    <div style="background-color: red;"></div>
    <div style="left: 100px; background-color: green;"></div>
    <div style="left: 200px; background-color: blue;"></div>
</body>