To change Shape Block Color on Hover, you can do these.
#1. First, find Shape ID.
In my example, it is: #block-yui_3_17_2_1_1737103644369_539
#2. Next, use this code to Custom CSS box.
If code doesn’t work, you can comment below, message or email me.
#block-yui_3_17_2_1_1737103644369_539:hover .sqs-shape.sqs-shape-rectangle {
background-color: #f1f !important;
}
#3. Result