<div class="gradient-border">
		<figure>
			<img src="https://i.imgur.com/jFKonXQ.jpeg" alt="White and Red Chevrolet">
		</figure>
	</div>

figure {
  margin: 0;
  padding: 10px;
}

img {
	width: 100%;
	display: block;
}

.gradient-border {
	width: 50%;
	position: relative;
	margin: 0 auto;
}

.gradient-border::before {
	content: "";
	position: absolute;
	z-index: -1;
	top: 0;
	left: 0;
	bottom: 0;
	right: 0;
	background-image: linear-gradient(#1a1a1a, #1560bd);
}