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<div class="container">
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
</div>
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.container {
display: flex;
flex-flow: row wrap;
justify-content: space-around;
}
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.box {
display: flex;
flex-wrap: wrap;
}
.box > * {
flex: 1 1 160px;
}