Скошенный уголок

by Ankhena

HTML

<div>
</div>

CSS

* {
    box-sizing: border-box
}

html,
body {
    height: 100%;
    padding: 0;
    margin: 0;
}

div {
    width: 80%;
    height: 300px;
    margin: 20px auto;
    background: linear-gradient(to right top, transparent 49.8%, #fff 50.2%) no-repeat right / 100px 100%, url(http://zastavok.net/main/priroda/1446112087.jpg) no-repeat top center / cover;
}