body {
  margin: 0;
	background: linear-gradient(to right top, #29aae1 50%, #ddd 50%);
  background-size: 100% calc(100% - 100vh + -6px);
  background-repeat: no-repeat;
}

body:before {
  content: '';
  position: fixed;
  top: 6px;
  bottom: 0;
  width: 100%;
  z-index: -1;
  background: white;
}