* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    -o-box-sizing: border-box;
    box-sizing: border-box;
    margin:0;
    padding:0;
}
/* Additionnal styles */
.video-slider {
      /*margin-top: 30px;*/
    width: 100%;
    height: 88%;
    background: #444;
    position: relative;
    overflow: hidden;
}
iframe {
    width: 100%;
    height: 100%;
}
.slide {
    position: absolute;
    top: 0;
    left: 100%;
    height: 100%;
    width: 100%;
    text-align: center;
    overflow: hidden;
}
.slide:first-child{
    left: 0;
}

video{
    max-height: 100%;
    max-width: 100%;
}
.slide-arrow{
    position: absolute;
    top: 0;
    left: 0;
    height: 45%;
    width: 15%;
    cursor: pointer;
    opacity: .2;
}
.slide-arrow:hover{
    opacity: 1;
}
.slide-arrow:after{
    content: "\003c";
    text-align: center;
    display: block;
    height: 10%;
    width: 100%;
    position: absolute;
    bottom: 0;
    left: 0;
    font-size: 3em;
}
.slide-arrow.right:after{
    content: "\003e";
}
.slide-arrow.right{
    left: auto;
    right: 0;
}