body {
  position: relative;
  margin: 0;
}
.sect {
  width: 100%;
  min-height: 500px;
}
#sect1,
#sect3 {
  background-color: #3333337d;
  color: #fff;
}
#sect2 {
  background-color: #dddddd7d;
  color: #333;
}

video {
  position: fixed;
  right: 0;
  bottom: 0;
  min-width: 105%;
  min-height: 100%;
  transform: translateX(calc((100% - 100vw) / 2));
  z-index: -2;
}
h1 {
  margin: 0;
  padding-top: 3rem;
  padding-left: 2rem;
}
h2 {
  margin: 0;
  padding-top: 3rem;
  padding-left: 2rem;
}