body {
  position: relative;
  margin: 0;
  min-height: 100vh;
}

body::before {
  content: "";
  position: absolute;
  top: 180px;
  left: 0;
  width: 100%;
  height: calc(100% - 230px);
  background: #F9F9F9;
  z-index: -1;
}