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chromium/third_party/blink/web_tests/external/wpt/css/css-images/gradient-button.html 

<!doctype html>
<meta charset="utf-8">
<title>Gradients with padding</title>
<link rel="help" href="https://drafts.csswg.org/css-images-3/#gradients">
<meta name="assert" content="gradients cover element padding">
<link rel="match" href="gradient-button-ref.html">
<style>
#button {
    width: 300px;
    height: 80px;
    padding: 20px 30px;
    background: linear-gradient(blue, green);
    border-width: 5px;
    border-style: solid;
    border-color: red;
    border-radius: 10px;
}
</style>
<div id="button"></div>