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<!DOCTYPE html>
<style>
.container {
border: solid 2px;
display: flow-root;
width: 300px;
}
.child {
background: green;
border: solid 2px;
box-sizing: border-box;
float: left;
height: 100px;
}
</style>
<div class="container">
<div class="child" style="width: 100px;"></div>
<div class="child" style="width: 200px;"></div>
</div>