You need to take a look at the footer on the demo, which currently reads
[kc_multi_icons icons="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" _id="238531" css_custom="{
kc-css:{
any:{
icon-style:{
color|i:
#f9fafa,
background-color|a:
#222222,
font-size|i:
16px,
border|a:
1px solid rgba(255, 255, 255, 0),
border-radius|a:
3px 3px 3px 3px,
margin-right|a:
0px},
icon-hover:{
color|a:hover i:
#f9fafa,
background-color|a:hover:
#222222,
border-color|a:hover:
rgba(255, 255, 255, 0),
border-radius|a:hover:
3px 3px 3px 3px}}}}"]