css resize image to fit div no stretching

1.div {
2  background-image: url(../images/your-image.png);
3  background-size:cover;
4  background-position:center;
5  background-repeat:no-repeat;
6}

1.cover {
2  object-fit: cover;
3  width: 50px;
4  height: 100px;
5}