igna.rocks/assets/js/less/effects/border-transitions/_ripple-in.less

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/* Ripple In */
.keyframes(~"@{nameSpace}-ripple-in", {
100% {
top: 0;
right: 0;
bottom: 0;
left: 0;
opacity: 1;
}
});
.ripple-in() {
@outerBorderWidth: 4px;
@innerBorderWidth: 4px;
.hacks();
position: relative;
&:before {
content: '';
position: absolute;
border: @primaryColor solid @outerBorderWidth;
top: -(6px + 6px);
right: -(6px + 6px);
bottom: -(6px + 6px);
left: -(6px + 6px);
opacity: 0;
.prefixed(animation-duration, 1s);
}
&:hover:before,
&:focus:before,
&:active:before {
.prefixed(animation-name, ~"@{nameSpace}-ripple-in");
}
}