Html
<figure class="picture gradient">
<img src="img/content/beispielbild.jpg" />
</figure>
Css
.picture {
position: relative;
}
.picture:before {
content: "";
position: absolute;
z-index: 1;
top: 0;
left: 0;
width: 100%;
pointer-events: none;
}
.picture.gradient:before {
height: 10px;
height: .625rem;
background-image: -webkit-linear-gradient(top, rgba(88, 88, 88, .15) 0%, rgba(0, 0, 0, 0) 100%);
background-image: -moz-linear-gradient(top, rgba(88, 88, 88, .15) 0%, rgba(0, 0, 0, 0) 100%);
background-image: linear-gradient(top, rgba(88, 88, 88, .15) 0%, rgba(0, 0, 0, 0) 100%);
}