header {
  background-image: url(https://lcapuano.com.br/assets/img/bkg.jpg);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  height: 100vh;
  background-color: #333;
}

#background-techs-switcher {
  text-align: center;
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}