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<html>
<head>
<style>
body {
margin: 0;
}
#container {
display: flex;
flex-direction: column;
border: 10px solid lime;
width: 80px;
height: 80px;
background-color: red;
}
#item {
background-color: lime;
min-height: 0;
width: 80px;
height: auto;
line-height: 80px;
}
</style>
</head>
<body>
<div id="container">
<div id="item"> </div>
</div>
</body>
</html>