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<!DOCTYPE html>
<style>
.block {
width: 75px;
height: 50px;
z-index: -1;
border: 5px dotted blue;
}
.container {
border: 1px solid;
position: relative;
width: 100px;
height: 100px;
display: inline-block;
margin-left: 50px;
margin-bottom: 50px;
}
.abs {
width: 50px;
height: 50px;
position: absolute;
background: purple;
}
</style>
<!-- start aligned -->
<div class="container"><div class="block">
<div class="abs"></div>
</div></div>
<div class="container"><div class="block">
<div class="abs" style="top: 0px;"></div>
</div></div>
<div class="container"><div class="block">
<div class="abs" style="left: 0px;"></div>
</div></div>
<br>
<!-- end aligned -->
<div class="container"><div class="block">
<div class="abs" style="top: -45px; left: 30px;"></div>
</div></div>
<div class="container"><div class="block">
<div class="abs" style="top: 50px; left: 30px;"></div>
</div></div>
<div class="container"><div class="block">
<div class="abs" style="top: -45px; left: 50px;"></div>
</div></div>
<br>
<!-- center aligned -->
<div class="container"><div class="block">
<div class="abs" style="top: -20px; left: 17.5px;"></div>
</div></div>
<div class="container"><div class="block">
<div class="abs" style="top: 25px; left: 17.5px;"></div>
</div></div>
<div class="container"><div class="block">
<div class="abs" style="top: -20px; left: 25px;"></div>
</div></div>
<br>