#wrapper {
  background: linear-gradient(to right, #fff 0%, #fff 0%, #fff 50%, #c0c0c0 100%);
}

#header {
  background: linear-gradient(165deg, rgba(255, 255, 255, 2) 20%, rgba(255, 255, 255, 0) 10px, rgba(255, 255, 255, 0) 130px);
}