display: inline-block
position: relative
display: inline-block
position: relative
+div.board3
+ width: 33.33%
+ padding-bottom: 33.33%
+
div.board5
width: 20%
padding-bottom: 20%
div.board5
width: 20%
padding-bottom: 20%
+div.board6
+ width: 16.66%
+ padding-bottom: 16.66%
+
div.board7
width: 14.28%
padding-bottom: 14.28%
div.board7
width: 14.28%
padding-bottom: 14.28%