change background Cover Size code example
Example 1: background image size css
#example1 {
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: auto;
}
#example2 {
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 300px 100px;
}
Example 2: background image height and width
.class{
background: url("../images/icons/map.png") no-repeat center center/50px 50px fixed;
}