@import url(http://fonts.googleapis.com/css?family=Montserrat);
html, body {
  overflow: hidden;
}

.background {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
  overflow: hidden;
  will-change: transform;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  height: 130vh;
  position: fixed;
  width: 100%;
  -webkit-transform: translateY(30vh);
          transform: translateY(30vh);
  -webkit-transition: all 1.2s cubic-bezier(0.22, 0.44, 0, 1);
  transition: all 1.2s cubic-bezier(0.22, 0.44, 0, 1);
}
.background:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.3);
}
.background:first-child {
  background-image: url(https://s25.postimg.org/w1f8kaazj/Photos_SBS_5.jpg);
  -webkit-transform: translateY(-15vh);
          transform: translateY(-15vh);
}
.background:first-child .content-wrapper {
  -webkit-transform: translateY(15vh);
          transform: translateY(15vh);
}
.background:nth-child(2) {
  background-image: url(https://s25.postimg.org/4ycyv4tnj/Photos_SBS_1.jpg);
}
.background:nth-child(3) {
  background-image: url(https://s25.postimg.org/uaw7istgf/Photos_SBS_6.jpg);
}

/* Set stacking context of slides */
.background:nth-child(1) {
  z-index: 3;
}

.background:nth-child(2) {
  z-index: 2;
}

.background:nth-child(3) {
  z-index: 1;
}

.content-wrapper {
  height: 100vh;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
      -ms-flex-pack: center;
          justify-content: center;
  text-align: center;
  -webkit-flex-flow: column nowrap;
      -ms-flex-flow: column nowrap;
          flex-flow: column nowrap;
  color: #fff;
  font-family: Montserrat;
  text-transform: uppercase;
  -webkit-transform: translateY(40vh);
          transform: translateY(40vh);
  will-change: transform;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  -webkit-transition: all 1.7s cubic-bezier(0.22, 0.44, 0, 1);
  transition: all 1.7s cubic-bezier(0.22, 0.44, 0, 1);
}

.content-title {
  font-size: 12vh;
  line-height: 1.2;
}

.content-subtitle {
  margin-bottom: 35px;
}

button {
  align-self: center;
  outline:none;
  height: 40px;
  width: 130px;
  border-radius:40px;
  background-color: transparent;
  border: 1.5px solid white;
  color:white;
  letter-spacing:0.5px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s ease;
}
button:hover {
  color: black;
  background: white;
}
button:active {
  letter-spacing: 1px ;
}


.background.up-scroll {
  -webkit-transform: translate3d(0, -15vh, 0);
          transform: translate3d(0, -15vh, 0);
}
.background.up-scroll .content-wrapper {
  -webkit-transform: translateY(15vh);
          transform: translateY(15vh);
}
.background.up-scroll + .background {
  -webkit-transform: translate3d(0, 30vh, 0);
          transform: translate3d(0, 30vh, 0);
}
.background.up-scroll + .background .content-wrapper {
  -webkit-transform: translateY(30vh);
          transform: translateY(30vh);
}

.background.down-scroll {
  -webkit-transform: translate3d(0, -130vh, 0);
          transform: translate3d(0, -130vh, 0);
}
.background.down-scroll .content-wrapper {
  -webkit-transform: translateY(40vh);
          transform: translateY(40vh);
}
.background.down-scroll + .background:not(.down-scroll) {
  -webkit-transform: translate3d(0, -15vh, 0);
          transform: translate3d(0, -15vh, 0);
}
.background.down-scroll + .background:not(.down-scroll) .content-wrapper {
  -webkit-transform: translateY(15vh);
          transform: translateY(15vh);
}