Hi,
Add the code below to your custom css.
.minimal-design .sf-icon-box-standard .sf-icon-cont:hover .sf-icon, .minimal-design .sf-icon-box-standard.sf-hover .sf-icon-cont .sf-icon {
color: #fff!important;
}
Done this by mistake but it looks good IMHO
https://www.dropbox.com/s/6ta39cabsvfdcvq/Screenshot%202015-08-28%2011.36.56.png?dl=0
achieve it using this css code and don’t use the above one.
.minimal-design .sf-icon-box-standard .sf-icon-cont:hover, .minimal-design .sf-icon-box-standard.sf-hover .sf-icon-cont {
background-color: #fff!important;
}
Hope it helps.
-Rui