<!DOCTYPE html>
<style>
html, body {
margin: 0px;
padding: 0px;
}
</style>
<div style="position: absolute; top: 100px; width: 200px; background-color: lightgreen;">
<div style="height: 50px; width: 50px; background-color: green"></div>
</div>
<!DOCTYPE html>
<style>
html, body {
margin: 0px;
padding: 0px;
}
</style>
<div style="position: absolute; top: 100px; width: 200px; background-color: lightgreen;">
<div style="height: 50px; width: 50px; background-color: green"></div>
</div>