Hy and thanks for your patience with me but i'm not a developer.
Probably i do something wrong and don't work.
I insert in my custom.css:
.services-section [class*=" icon-"], .services-section [class^="icon-"],
.sidebar [class*=" icon-"], .sidebar[class^="icon-"] {
font-size:25px;
color:#00aeef;
cursor: pointer;
border-radius:50%;
border:1px solid #00aeef;
padding:31px;
display:inline-block;
margin-bottom:5px;
position: relative;
z-index: 9;
height: 90px;
width: 90px;
-webkit-transition:color .3s;
-moz-transition:color .3s;
transition:color .3s
}
.services-section [class*=" icon-"]:after, .services-section [class^="icon-"]:after,
.sidebar [class*=" icon-"]:after, .sidebar [class^="icon-"]:after {
-webkit-transform:scale(1.3);
-moz-transform:scale(1.3);
-ms-transform:scale(1.3);
transform:scale(1.3);
opacity:0;
background:#00aeef;
border-radius: 50%;
box-sizing: content-box;
content: "";
height: 100%;
pointer-events: none;
position: absolute;
width: 100%;
top:-2px;
left:-2px;
padding:2px;
-webkit-transition:-webkit-transform .2s,opacity .3s;
-moz-transition:-moz-transform .2s,opacity .3s;
transition:transform .2s,opacity .3s
}
.services-section .row > div:hover [class*=" icon-"], .services-section .row > div:hover [class^="icon-"]
.sidebar .row > div:hover [class*=" icon-"], .sidebar .row > div:hover [class^="icon-"] {
color: #fff;
}
.services-section .row > div:hover [class*=" icon-"]:after, .services-section .row > div:hover [class^="icon-"]:after,
.sidebar .row > div:hover [class*=" icon-"]:after, .sidebar .row > div:hover [class^="icon-"]:after {
-webkit-transform:scale(1);
-moz-transform:scale(1);
-ms-transform:scale(1);
transform:scale(1);
opacity:1
}