<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
.container {
width: 500px;
height: 100px;
border: 1px solid #000;
}
.left {
width: auto;
height: 100px;
background: #d1d1d1;
overflow: hidden;
}
.right {
height: 100px;
width: 100px;
background: #d69292;
float: left;
}
</style>
</head>
<body>
<div class="container">
<div class="right"></div>
<div class="left"></div>
</div>
</body>
</html>