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HTML

              
                <div class=container>
	<div id="proparallax">
		<img class="one" src="https://images.wallpaperscraft.com/image/leaves_plant_green_118405_800x600.jpg" /> 
		<img class="two" src="https://images.wallpaperscraft.com/image/cubes_shape_glow_background_85043_800x600.jpg" />
		<img class="three" src="https://images.wallpaperscraft.com/image/wave_sea_water_transparent_splashes_26417_800x600.jpg" />
	</div>
</div>
              
            
!

CSS

              
                body {
	font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
	width: 100%;
	min-height: 45rem;
	font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
	text-align: center;
	background-color: whitesmoke;
}
.container {
	width:100%;
	padding-right:15px;
	padding-left:15px;
	margin-right:auto;
	margin-left:auto;
	max-width:800px
}
/* Basic appearance stuff ends here */

/* Parallax Horizontal Scroller - by Bree Dulmage, 2020 */
#proparallax {
	display: block;
	position: relative;
	overflow: hidden;
	min-height: 37.5rem;
	border: 10px solid black;
	box-shadow: 0px 8px 10px 8px grey;
}	

#proparallax img {
	position: absolute;
	width: 50rem;
	height: 37.5rem;
	overflow: hidden;
	object-fit: cover;
}

@keyframes parallax_one { /* controls img.one movement */
	0% { /* .imageloaded */
		height: 37.5rem;
		width: 50rem;
		left: 0rem;
		opacity: 1;
	}
	/* .imagehold runs from 0 to 27.77% */
	27.77% { /* .imageloaded */
		width: 50rem;
		left: 0rem;
	}
	27.78% { /* .imagepreunload */
		width: 50rem;
		left: 0rem;
		right: 50rem;
	}
	33.33% { /* .imageunloaded */
		height: 37.5rem;
		width: 0rem;
		left: 0rem;
		right: 0rem;
		opacity: 1;
	}
	33.34% { /* imageoff */
		opacity: 0;	
	}
	94.43% { /* .imageon */
		left: 0rem;
		opacity: 0;
	}
	94.44% { /* .imageinitial */
		height: 37.5rem;
		width: 0rem;
		left: 50rem;
		opacity: 1;
	}
	100% { /* .imageloaded */
		width: 50rem;
		left: 0rem;
		opacity: 1;		
	}
}

@keyframes parallax_two { /* controls img.two movement */
	0% { /* .imageoff */
		opacity: 0;
	}
	27.77% { /* .imageon */
		left: 0rem;
		opacity: 0;
	}
	27.78% { /* .imageinitial */
		width: 0rem;
		height: 37.5rem;
		left: 50rem;
		opacity: 1;
	}
	33.33% { /* .imageloaded */
		width: 50rem;
		left: 0rem;
	}
	/* .imagehold runs from 33.34% - 61.10% */
	61.10%{ /* .imageloaded */
		width: 50rem;
		left: 0rem;
	}
	61.11% { /* .imagepreunload */
		width: 50rem;
		left: 0rem;
		right: 50rem;
	}
	66.67% { /* .imageunloaded */
		width: 0rem;
		right: 0rem;
		left: 0rem;
		height: 37.5rem;
		opacity: 1;
	}
	66.68% { /* .imageoff */
		opacity: 0;
	}
	100% { /* .imageoff */
		opacity: 0;
	}
}

@keyframes parallax_three { /* controls img.three movement */
	0% { /* .imageoff */
		opacity: 0;
	}
	61.10%{ /* .imageon */
		opacity: 0;
	}
	61.11% { /* .imageinitial */
		width: 0rem;
		height: 37.5rem;
		left: 50rem;
		opacity: 1;		
	}
	66.67% { /* .imageloaded */
		width: 50rem;
		left: 0rem;
	}
	/* .imagehold runs from 66.67% - 94.43% */
	94.43% { /* .imageloaded */
		width: 50rem;
		left: 0rem;
	}
	94.44% { /* .imagepreunload */
		width: 50rem;
		left: 0rem;
		right: 50rem;
	}
	100% { /* imageunloaded */
		width: 0rem;
		right: 0rem;
		left: 0rem;
		height: 37.5rem;
		opacity: 1;
	}
}

#proparallax img.one{
	animation-name: parallax_one; /* controls img.one movement */
	animation-timing-function: linear;
	animation-iteration-count: infinite;
	animation-duration: 18s;
	animation-direction: forwards;
	object-fit: cover;
}

#proparallax img.two {
	animation-name: parallax_two; /* controls img.two movement */
	animation-timing-function: linear;
	animation-iteration-count: infinite;
	animation-duration: 18s;
	animation-direction: forwards;
	object-fit: cover;
}

#proparallax img.three {
	animation-name: parallax_three; /* controls img.three movement */
	animation-timing-function: linear;
	animation-iteration-count: infinite;
	animation-duration: 18s;
	animation-direction: forwards;
	object-fit: cover;
}
              
            
!

JS

              
                
              
            
!
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