SOURCE

<div class="banner">
	<div class="item">
		<a href="" class="ban-pic" style="background-image: url('https://picsum.photos/1920/600')">
			<div class="txt">
				<h1>Hello！</h1>
			</div>
		</a>
	</div>
</div>

.ban-pic {
	display: block;
	position: relative;
	height: 0;
	padding-top: 31.25%;
	background-repeat: no-repeat;
	background-position: center center;
	-webkit-background-size: cover;
	background-size: cover;
}
.ban-pic .txt {
	position: absolute;
	top: 0;
	left: 0;
	bottom: 0;
	width: 100%;
	text-align: center;
	font-size: 0;
}
.ban-pic .txt:after {
	content: '';
	display: inline-block;
	width: 0;
	height: 100%;
	vertical-align: middle;
}
.ban-pic .txt h1 {
	display: inline-block;
	vertical-align: middle;
	font-size: 40px;
}
@media only screen and (max-width: 959px) {
	.ban-pic {
		padding-top: 50%;
	}
}