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Test Info:

<!DOCTYPE HTML>
<style>
#a, #b {
width: 100px;
height: 100px;
background-color: grey;
-moz-appearance: none;
box-shadow: 4px 4px 3px black;
border: none !important;
position: absolute;
}
#a {
top: 20px;
left: 20px;
}
#b {
top: 170px;
left: 20px;
</style>
<input type="button" id="a" value=""></input>
<button id="b"></button>