CodePen Embed - Box Shadow Basic 2

<div class="parent">
  <div class="thebox"><div>
</div>
    

<!--  //none | h-offset  v-offset  blur spread //color |  inset | initial | inherit -->

.parent {
  background-color: rgba(243,244,246,1);
  postion: absolute;
  width: 100vw;
  height: 100vh;
}
.thebox {
  width:250px;
  height:250px;
}
.thebox {
  border-radius : 8px;
  position: relative;
  left: 50%;
  top:50%;
  transform: translate(-50%,-50%)
}

.thebox {
  border-color : transparent;
  backgroud-color: #fff;
  box-shadow : 0px 10px 15px 12px  rgba(0,0,0,0.1) inset;
}

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