.large-header {
   position: relative;
   width: 100%;
   overflow: hidden;
   background-size: cover !important;
   background-position: center center !important;
   z-index: 1;
   height: 100vh !important;
}

.demo .large-header {
   background-image: url("../images/Slide2.jpg");
}

.main-title {
   position: absolute;
   margin: 0;
   padding: 0;
   color: #fff;
   text-align: center;
   top: 40%;
   left: 50%;
   -webkit-transform: translate3d(-50%, -50%, 0);
   transform: translate3d(-50%, -50%, 0);
    font: 300 50px/1.2 "Oswald", sans-serif;
    letter-spacing: 0.35em;
    text-transform: uppercase;
}
@media only screen and (max-width: 768px) {
   .demo .main-title {
      font-size: 3em;
   }
}