Hi,
Try this in the Custom CSS.
.standard-browser .sf-icon-box-animated:hover .back, .no-csstransitions .sf-icon-box-animated .back, .sf-icon-box-animated.sf-mobile-hover .back {
opacity: 1;
transition: opacity .25s ease-in-out;
-moz-transition: opacity .25s ease-in-out;
-webkit-transition: opacity .25s ease-in-out;
}
.standard-browser .sf-icon-box-animated:hover .front, .no-csstransitions .sf-icon-box-animated .front, .sf-icon-box-animated.sf-mobile-hover .front {
opacity: 0.5;
}
.sf-icon-box-animated .front {
position: relative;
z-index: 8;
display: block;
width: 100%;
height: auto;
padding: 70px 20px;
webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-ms-box-sizing: border-box;
box-sizing: border-box;
opacity: 1;
transition: opacity .25s ease-in-out;
-moz-transition: opacity .25s ease-in-out;
-webkit-transition: opacity .25s ease-in-out;
}
.sf-icon-box-animated .back {
overflow: hidden;
background: #ffffff;
padding: 20px;
width: 100%;
height: 100%;
webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-ms-box-sizing: border-box;
box-sizing: border-box;
opacity: 0.5;
}
Also I suggest you to remove those appropirate class styles from style.css
Let us know,
Thanks,
laranz.