html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    text-shadow: 1px 2px 1.5px rgba(0,0,0,0.2);
}
.nav {
    position: absolute;
    z-index: 100;
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    width: 300px;
    color: white;

}
#container {
    height: 100%;
    overflow: hidden;
    width: 120%;
    margin-left: -5%;

}

#container > div {
    height: 150%;
    margin-top: -10%;
    padding: 10% 5%;
    width: 34.75%;
    float: left;
    color: #ccc;
    background-color: rgba(0,0,0,0.5)
    -webkit-transform: rotate(5deg);
    -moz-transform: rotate(5deg);
    -o-transform: rotate(5deg);
    -ms-transform: rotate(5deg);
    transform: rotate(5deg);
}

#container > div h1 {
    text-align: center;
    cursor: pointer;
    -webkit-transform: rotate(-5deg);
    -moz-transform: rotate(-5deg);
    -o-transform: rotate(-5deg);
    -ms-transform: rotate(-5deg);
    transform: rotate(-5deg);
    margin-top: 30%;
    font-size: 6rem;
}
.item {
    position: relative;
    display: inline-block;
    vertical-align: top;
    background-position: top center;
    background-repeat: no-repeat;
    height: 100%;
    width: 50%;
}

.item, .item h1 {
    color: #000;
}
.item:nth-child(1) {
    background: #fff;
    background-image: url(https://source.unsplash.com/random/2048x2048/?wedding);
}
.item:nth-child(2) {
    background: #000;
    background-image: url(https://source.unsplash.com/random/2048x2048/?larp);
}
.item:nth-child(2), .item:nth-child(2) h1 {
    color: #fff;
}

.item:before  {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: inherit;
    content: ' ';
}
.item:nth-child(1):before {
    background-color: rgba(255, 255, 255, 0.25) ;
}
.item:nth-child(2):before {
    background-color: rgba(0, 0, 0, 0.25) ;
}
.item, .item:nth-child(2) {
    cursor: pointer;
  -webkit-filter: grayscale(100%); /* Ch 23+, Saf 6.0+, BB 10.0+ */
  filter: grayscale(100%); /* FF 35+ */
}
.item:hover, .item:nth-child(2):hover {
  transition: filter .25s ease-in-out;
  -webkit-filter: grayscale(0%); /* Ch 23+, Saf 6.0+, BB 10.0+ */
  filter: grayscale(0%); /* FF 35+ */
}