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Test Info:

<!DOCTYPE html>
<html>
<style>
.test {
background-color: #fec;
display: inline-block;
width: 800px;
height: 800px;
}
.second {
box-shadow: inset 0 400px 1px 0px red;
}
.leftCut {
position: absolute;
margin-left: 0px;
margin-top: 0px;
width: 10px;
height: 800px;
background-color: black;
}
.rightCut {
position: absolute;
margin-left: 790px;
margin-top: 0px;
width: 10px;
height: 800px;
background-color: black;
}
.centerCut {
position: absolute;
margin-top: 395px;
width: 800px;
height: 20px;
background-color: black;
}
</style>
<body>
<div class="leftCut"></div>
<div class="rightCut"></div>
<div class="centerCut"></div>
<div class="test second"></div>
</body>
</html>