left-side-width = 30%
right-side-width = 70%

.page-container {
  position absolute
  left: 0
  right: 0
  top: 0
  bottom: 0
  background: #fff

  .page-left {
    float: left
    width left-side-width
    height 100%
  }

  .page-right {
    float: right
    width right-side-width
    height 100%
  }

}