#smooth-content {
  background: white;
}

main {
  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUAQMAAAC3R49OAAAABlBMVEX////09PQtDxrOAAAAE0lEQVQI12P4f4CBKMxg/4EYDAAFkR1NiYvv7QAAAABJRU5ErkJggg==');
  background-image: linear-gradient(45deg, #f0f0f0 25%, transparent 25%),
    linear-gradient(-45deg, #f0f0f0 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #f0f0f0 75%),
    linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  margin-top: 140px;
  width: 100vw;
  height: 100vh;
}