html{
  background-color: #aaa;
  height: 100%;
}

body{
  background-color:#000;
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden !important;
}
<!--
#3d{
  background-color: #000;
  width: 68%;
  height: 100%;
  float: right;
  margin-bottom: 2px;
}

#sliceX{
  border-top: 2px solid yellow;
  border-right: 2px solid yellow;
  border-bottom: 2px solid yellow;
  background-color: #000;
  width: 32%;
  height: 30%;
  float: none;
}

#sliceY{
  border-top: 2px solid red;
  border-right: 2px solid red;
  border-bottom: 2px solid red;
  background-color: #000;
  width: 32%;
  height: 30%;
  float: none;
}

#sliceZ{
  border-top: 2px solid green;
  border-right: 2px solid green;
  border-bottom: 2px solid green;
  background-color: #000;
  width: 32%;
  height: 30%;
  float: none;
}
-->