img.piece
width: 100%
+ z-index: 10
img.piece, img.mark-square, img.circle-square
max-width: 100%
height: auto
display: block
+img.mark-square, img.circle-square
+ position: absolute
+ z-index: 20
+
img.mark-square
opacity: .7
width: 76%
- position: absolute
top: 12%
left: 12%
img.circle-square
opacity: 0.7
width: 100%
- position: absolute
top: 0
left: 0