style.css

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-size: 50px;
  font-family: fantasy;
  color: #DC143C;
}

.container {
  display: inline-block;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

.block {
  box-sizing: border-box;
  position: absolute;
  word-wrap: break-word;
  overflow: auto;
  display: inline-block;
  width: 50%;
  height: 50%;
}

.top-left {
  position: absolute;;
  left: 0;
  display: inline-block;
  width: 50%;
  height: 50%;
  background-color: #AAF200;
}

.top-right {
  text-align: right;
  right: 0;
  background-color: #FFCF75;
}

.center-box {
  bottom: 25%;
  left: 25%;
  background-color: #00BFFF;
  z-index: 10;
}

.bottom-left {
  left: 0;
  bottom: 0;
  background-color: #FF8000;
  text-align: left;
}

.bottom-right {
  text-align: right;
  right: 0;
  bottom: 0;
  display: inline-block;
  background-color: lightgreen;
}

.filler {
  display:inline-block;
  position: relative;
  width: 50%;
  height: 50%;
  right:0;
  top: 0;
  z-index: -1;
}