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<!DOCTYPE html>
<style>
.cb {
position: relative;
border: 3px solid black;
height: 100px;
width: 150px;
display: inline-block;
vertical-align: top;
margin: 5px;
}
.abs {
margin: 0;
position: absolute;
box-sizing: border-box;
top: 3px;
left: 3px;
outline: 2px solid lime;
width: calc(100% - 6px);
height: calc(100% - 6px);
}
</style>
<div class="cb"><button class="abs">button</button></div>