.header-img
position: relative
100%
height: 0
padding-top: 100%
img
position: absolute
top: 0
left: 0
100%
height: 100%
.header-img
position: relative
100%
height: 0
padding-top: 100%
img
position: absolute
top: 0
left: 0
100%
height: 100%