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<!doctype html>
<meta charset="utf-8">
<title>Blue Box with Green Frame</title>
<style>
#a {
width: 300px;
height: 200px;
position: absolute;
left: 100px;
top: 100px;
border-width: 50px;
border-style: solid;
border-image: linear-gradient(green, green);
background-color: blue;
background-clip: content-box;
border-image-slice: 33%;
padding-left: 100px;
padding-top: 50px;
padding-right: 10px;
padding-bottom: 50px;
}
</style>
<div id="a"></div>