html, body {
  background: rgba(0, 116, 218, 0.5);
  background: -moz-linear-gradient(-45deg, rgba(0, 151, 255, 0.75) 1%,rgba(0, 151, 255, 1) 100%);
  background: -webkit-linear-gradient(-45deg, rgba(0, 151, 255, 0.75) 1%,rgba(0, 151, 255, 1) 100%);
  background: linear-gradient(135deg, rgba(0, 151, 255, 0.75) 1%,rgba(0, 151, 255, 1) 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#0097ff', endColorstr='#07bcdb',GradientType=1 );
}

.large-header {
  position: relative;
  width: 100%;
  background: rgba(0, 151, 255, 1);
  overflow: hidden;
  background-size: cover;
  background-position: center center;
  z-index: 1;
}

.demo .large-header {
  background-color: #0097ff;
  opacity: 0.8;
}

.main-title {
  position: absolute;
  margin: 0;
  padding: 0;
  color: #F9F1E9;
  text-align: center;
  top: 50%;
  left: 50%;
  -webkit-transform: translate3d(-50%, -50%, 0);
  transform: translate3d(-50%, -50%, 0);
}
h1,h2,h3,h4,h5 {
  color: #fff;
}

@media only screen and (max-width: 768px) {
  .demo .main-title {
    font-size: 3em;
  }
}