<!DOCTYPE html>
<html>
<head>
<style>
body, html {
    margin: 0;
}

.cover-block-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 200px;
    height: 200px;
    background-color: black;
}
</style>
</head>
<body>
<img src="../resources/green-400x400.png"></img>
<div class="cover-block-container"></div>
</body>
</html>