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<!DOCTYPE html>
<meta charset="utf-8">
<style>
.wrapper {
display: table-cell;
width: 200px;
height: 200px;
vertical-align: middle;
}
.wrapper > div {
width: 100px;
border: solid;
text-align: center;
}
</style>
<button>
<div class="wrapper">
<div>ABC</div>
</div>
</button>