header {
  align-items: center;
  display: flex;
  font-size: 18px;
  height: 100vh;
  justify-content: center;
  overflow: hidden;
  position: relative;
  text-align: center;
  transform-style: preserve-3d;
  perspective: 100px;
}

header:before {
  background: linear-gradient(to bottom, rgba(0,0,0,0), rgba(0,0,0,.8)),
              url(https://merovingian.com/matrix-wallpaper.jpg) no-repeat bottom;
  background-size: cover;
  content: "";
  position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  z-index: -1;
}

header:after {
  background: #F9FCFF;
  content: "";
  height: 40rem;
  left: -5%;
  position: absolute;
    right: -5%;
    top: 90%;
  transform-origin: 0 0;
  transform: rotateZ(-4deg);
  z-index: 0;
}

.header-title, .header-subtitle {
  color: #fff;
}

.header-subtitle {
  text-transform: uppercase;
  margin-bottom: 5rem;
}

.header-button {
  transform: translateZ(.1px);
  position: relative;
  z-index: 10;
}