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<!DOCTYPE html>
<meta charset=utf-8>
<style>
div {
width: 20em;
height: 5em;
border-radius: 2em;
border-style: solid;
border-width: .25em;
background: #eee;
overflow: clip;
}
span {
display: inline-block;
background: blue;
width: 8em;
height: 100%;
}
</style>
<div><span></span></div>