style.css

* {box-sizing:border-box}

body {
  background-color: #d1d3d7;
}

.video1 {
  width: 42.5vw;
  height: 24vw;
  background-color: red;
  position: fixed;
  margin-left: 23vw;
  margin-top: -29.5vw;
}

.gif1 {
  width: 16.7vw;
  height: 25.1vw;
  background-color: black;
  position: fixed;
  margin-left: 80.3vw;
  margin-top: -29.9vw;
}

.navigation {
  margin-top: 25px;
}

.double {
  width: 49.7%;
}

/* Slideshow container */
.slideshow-container {
  max-width: 100%;
  position: relative;
  margin: auto;
  margin-top: 80px;
  height: 35.7vw;
  font-size: 0px;
}

/* Hide the images by default */
.mySlides {
  display: none;
  width: 100%;
}


/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 24px;
  transition: 0.2s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}

/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: #bbb;
}


.slider {
  width: 50%;
  padding: 0px;
  margin: 0px;
}

/* The dots/bullets/indicators */
.dot {
  cursor: pointer;
  height: 2px;
  width: 6.249%;
  margin: 0px;
  padding: 0px;
  float: left;
  background-color: #bbb;
  display: inline-block;
  transition: background-color 0.2s ease;
}

.active, .dot:hover {
  background-color: white;
}

/* Fading animation */
.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 0.1s;
  animation-name: fade;
  animation-duration: 0.1s;
}

@-webkit-keyframes fade {
  from {opacity: .4}
  to {opacity: 1}
}

@keyframes fade {
  from {opacity: .4}
  to {opacity: 1}
}


.videoWrapper {

	padding-bottom: 56.25%; /* 16:9 */
	padding-top: 25px;
	height: 0;
  float: left;
  z-index: 1;
}
.videoWrapper iframe {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
    z-index: 1;
}