Style.css

<style>
* {
	padding: 0;
	margin: 0;
	box-sizing: border-box;
}
img {
	height: 100%;
	width: 100%;
}
body {
	background-color: rgb(0, 0, 0);
	color: whitesmoke;
}
.container {
	height: 100vh;
	/* width: 100%; */
	max-width: 1080px;
	margin: 0 auto;
	display: flex;
	justify-content: center;
	align-items: center;
}
.container .col-left {
	flex: 1;
	padding: 20px;
}
.container .col-left h1 {
	font-size: 80px;
	position: relative;
	color: transparent;
	animation: text_revealing 0s ease forwards;
	/* animation-delay: 1s; */
	display: inline-block;
	/* opacity: 0; */
}
.container .col-left h1:nth-child(1) {
	animation-delay: 1s;
}
.container .col-left h1:nth-child(2) {
	animation-delay: 2s;
}
.container .col-left h1:nth-child(3) {
	animation-delay: 3s;
}
.container .col-left h1:nth-child(1) span {
	animation-delay: .5s;
}
.container .col-left h1:nth-child(2) span {
	/* animation-direction: reverse; */
	animation-delay: 1.5s;
}
.container .col-left h1:nth-child(3) span {
	animation-delay: 2.5s;
}
.container .col-left h1 span {
	content: '';
	position: absolute;
	height: 100%;
	width: 0;
	left: 0;
	top: 0;
	background-color: crimson;
	animation: revealing 1s ease forwards;
	animation-delay: .5s;
}
.container .col-right {
	flex: 1;
	padding: 20px;
}
@keyframes text_revealing {
	100% {
		color: white;
	}
}
@keyframes revealing {
	50% {
		width: 100%;
		left: 0;
	}
	100% {
		left: 100%;
		width: 0%;
	}
}

@media only screen and (max-width: 890px) {
	.container {
		flex-direction: column-reverse;
	}
	.container .col-right {
		width: 300px;
	}
	.container .col-left h1 {
		display: block;
		width: fit-content;
	}
}
</style>