#main-header {
  position: relative;
  background-color: black;
  height: 75vh;
  min-height: 25rem;
  width: 100%;
  overflow: hidden;
}

header video {
  position: absolute;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  z-index: 0;
  -ms-transform: translateX(-50%) translateY(-50%);
  -moz-transform: translateX(-50%) translateY(-50%);
  -webkit-transform: translateX(-50%) translateY(-50%);
  transform: translateX(-50%) translateY(-50%);
}

#main-header .container {
  position: relative;
  z-index: 2;
  padding-top: 150px;
}

#main-header .overlay {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background-color: black;
  opacity: 0.6;
  z-index: 1;
}

.dark-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
}

#page-header {
  height: 200px;
  background: url('../img/galaxy1.jpg');
  background-position: 0 -360px;
  background-attachment: fixed;
  color: #fff;
  border-bottom: 1px #eee solid;
  padding-top: 50px;
}

.about-img {
  margin-top: -50px;
}

@media (pointer: coarse) and (hover: none) {
  header {
    background: url('https://source.unsplash.com/XT5OInaElMw/1600x900') black
      no-repeat center center scroll;
  }
  header video {
    display: none;
  }
}