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<!DOCTYPE html>
<style>
#flex {
display: flex;
flex-wrap: wrap;
width: 100px;
height: 100px;
gap: 10px;
}
#flex > div {
background: green;
}
</style>
<div id="flex">
<div style="width: 50px;"></div>
<div style="width: 40px;"></div>
<div style="width: 40px;"></div>
<div style="width: 50px;"></div>
</div>