.slider {
	width: 100%;
	height: 100vh;
	position: absolute;
}
.slider-content {
	height: 100%;
	overflow: hidden;
	position: absolute;
	width: 100%;
}
.slide {
	height: 100%;
	width: 100%;
	display:table;
}
.slide > div {
	display: table-cell;
	vertical-align: middle;
	text-align: center;
	color:#fff;
	text-shadow:0 1px 4px #000;
}
@keyframes scale{
  100% {
  	transform: scale(1.25);
  	-webkit-transform: scale(1.25);
	-moz-transform:  scale(1.25);
  	-ms-transform:  scale(1.25);
	}
}
.sl1, .sl2, .sl3, .sl4{
	backface-visibility: hidden; 
	background-size: cover !important;
	background-position: left bottom !important;
	animation: scale 10s linear infinite;
}
.sl1 {
	background: url(https://bestinterfest.ru/assets/images/slider1.jpg) no-repeat;
}
.sl2 {
	background: url(https://bestinterfest.ru/assets/images/slider2.jpg) no-repeat;
}
.sl3 {
	background: url(https://bestinterfest.ru/assets/images/slider3.jpg) no-repeat;
}
.sl4 {
	background: url(https://bestinterfest.ru/assets/images/slider4.jpg) no-repeat;
}