If you use image as background than add class ".bg-img" in image and add below class in
parent.
.ratio_40 - 40%
.ratio_45 - 45%
.ratio2_1 - 50%
.ratio2_3 - 60%
.ratio3_2 - 66.66%
.ratio_landscape - 75%
.ratio_square - 100%
.ratio_asos - 127.77%
.ratio_portrait - 150%
.ratio1_2 - 200%
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