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<html>
<head>
<style>
body {
margin: 0;
}
.outerContainer {
display: flex;
height: 100px;
background-color: red;
}
.innerContainer {
display: flex;
flex: 1;
background-color: lime;
}
</style>
</head>
<body>
<div class="outerContainer">
<div class="innerContainer"></div>
</div>
</body>
</html>