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<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<title>border-box and fit-content should include borders</title>
<style>
.wrapper {
border: 1px solid red;
width: 540px;
}
.item {
background-color: blue;
padding: 10px 20px;
}
.content {
width: 500px;
height: 50px;
background-color: green;
}
</style>
<div class="wrapper"><div class="item"><div class="content"></div></div></div>