This is the custom CSS code I’ve added for the Single Post Template:

/* Singe Post Video Image */

.wp-block-embed.is-type-video {
	background: url(https://playground.divilover.com/wp-content/uploads/2021/02/laptop-bg3.png) no-repeat;
	background-size: 100% auto;
	max-width: 875px;
}

.wp-block-embed__wrapper {
	max-width: 69%;
	margin: 0 auto;
	padding: 3.8% 0 25%;
}


/* Single Post Nav */

span.nav-previous,
span.nav-next {
	float: none;
	display: block;
}

span.nav-previous a,
span.nav-next a {
	padding: 100px 50px;
	display: block;
	width: 100%;
	transition: all .3s ease-in-out;
}

span.nav-previous a:hover,
span.nav-next a:hover {
	background: #b1e5e0;
}

span.nav-previous {
	text-align: right;
}

@media (max-width:980px) {
	span.nav-previous {
		text-align: left;
	}
	span.nav-previous a,
	span.nav-next a {
		padding: 50px;
	}
}


/* Single Post Comments */

p.comment-form-comment {
	width: 51%;
	float: left;
	margin-right: 2%;
}

p.comment-form-cookies-consent {
	clear: both;
}


/* Single Post Meta */

.dl-meta {
	display: flex;
	justify-content: center;
}

.dl-meta .et_pb_module_header {
	padding: 0;
}

.dl-meta .et_pb_blurb .et_pb_blurb_container {
	vertical-align: middle;
}

@media (max-width:980px) {
	.dl-meta {
		flex-direction: column;
		align-items: center;
	}
	.dl-meta .et_pb_blurb {
		width: 80%;
		max-width: 200px;
	}
}