Hover effect works only in firefox - css

Question

any idea why this doesn't work in any other browsers apart from Firefox?
I have tried chrome, safari and IE (obviously, it won't work, because nothing does with IE).
thanks!
the SASS code is below, in case it helps:
#import url(http://fonts.googleapis.com/css?family=Bree+Serif);
$w: 200;
$h: 180;
$duration: 300ms;
$timing-fn: ease;
$turquoise: #1ABC9C;
$wet-asphalt: #34495E;
$midnight-blue: #2C3E50;
$clouds: #ECF0F1;
* {box-sizing: border-box}
body {background-color: #fff}
h1 {
margin: 0 auto 5px;
text-align: center;
}
h3 {font-family: 'Bree Serif', serif}
.container {
width: 840px;
margin: 0 auto;
}
header {
font-family: 'Bree Serif', serif;
text-align: center;
margin: 50px 0 25px;
color: $wet-asphalt;
p {
margin: 0;
color: transparentize($wet-asphalt, .6);
}
}
ul {
padding: 0;
margin: 0 0 50px;
&:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
}
li {
position: relative;
overflow: hidden;
border-radius: 4px;
list-style: none;
float: left;
width: #{$w}px;
height: #{$h}px;
margin: 5px;
padding: 0;
perspective: 500px;
a {
display: inline-block;
vertical-align: top;
text-decoration: none;
border-radius: 4px;
}
h3 {
margin: 0;
font-size: 16px;
color: transparentize(#fff, .1);
}
p {
font-size: 12px;
line-height: 1.5;
color: transparentize(#fff, .2);
}
.normal {
width: 100%;
height: 100%;
background-color: $clouds;
color: transparentize($wet-asphalt, .4);
box-shadow: inset 0 2px 20px darken($clouds, 2);
text-align: center;
font-size: 50px;
line-height: #{$h}px;
svg {
pointer-events: none;
width: 50px;
path {
fill: transparentize($wet-asphalt, .8);
}
}
}
.info {
width: 100%;
height: 100%;
padding: 20px;
position: absolute;
top: 0;
left: 0;
overflow: hidden;
border-radius: 4px;
pointer-events: none;
background-color: transparentize($turquoise, .1);
transform: rotate3d(1, 0, 0, 90deg);
}
}
.in-top .info {
transform-origin: 50% 0%;
animation: in-top $duration $timing-fn 0ms 1 forwards;
}
.in-right .info {
transform-origin: 100% 0%;
animation: in-right $duration $timing-fn 0ms 1 forwards;
}
.in-bottom .info {
transform-origin: 50% 100%;
animation: in-bottom $duration $timing-fn 0ms 1 forwards;
}
.in-left .info {
transform-origin: 0% 0%;
animation: in-left $duration $timing-fn 0ms 1 forwards;
}
.out-top .info {
transform-origin: 50% 0%;
animation: out-top $duration $timing-fn 0ms 1 forwards;
}
.out-right .info {
transform-origin: 100% 50%;
animation: out-right $duration $timing-fn 0ms 1 forwards;
}
.out-bottom .info {
transform-origin: 50% 100%;
animation: out-bottom $duration $timing-fn 0ms 1 forwards;
}
.out-left .info {
transform-origin: 0% 0%;
animation: out-left $duration $timing-fn 0ms 1 forwards;
}
#keyframes in-top {
from {transform: rotate3d(-1, 0, 0, 90deg);}
to {transform: rotate3d(0, 0, 0, 0deg);}}
#keyframes in-right {
from {transform: rotate3d(0, -1, 0, 90deg);}
to {transform: rotate3d(0, 0, 0, 0deg);}}
#keyframes in-bottom {
from {transform: rotate3d(1, 0, 0, 90deg);}
to {transform: rotate3d(0, 0, 0, 0deg);}}
#keyframes in-left {
from {transform: rotate3d(0, 1, 0, 90deg);}
to {transform: rotate3d(0, 0, 0, 0deg);}}
#keyframes out-top {
from {transform: rotate3d(0, 0, 0, 0deg);}
to {transform: rotate3d(-1, 0, 0, 102deg);}}
#keyframes out-right {
from {transform: rotate3d(0, 0, 0, 0deg);}
to {transform: rotate3d(0, -1, 0, 102deg);}}
#keyframes out-bottom {
from {transform: rotate3d(0, 0, 0, 0deg);}
to {transform: rotate3d(1, 0, 0, 101deg);}}
#keyframes out-left {
from {transform: rotate3d(0, 0, 0, 0deg);}
to {transform: rotate3d(0, 1, 0, 102deg);}}