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<!DOCTYPE HTML>
<html>
<head>
<style>
#container {
height: 500px;
width: 500px;
position: relative;
overflow: hidden;
}
#panel {
position:absolute;
height: 100%;
width: 100%;
top: 0;
left: 0;
transform: translateX(0);
background-color: yellow;
}
</style>
</head>
<body>
<div id="container">
<div id="panel">
<div style="width:300px; height:50px; background:blue;"></div>
</div>
</div>