Solved: Help me make this CSS work on Firefox please

Have a look here (pw: paris)
Each of the boxes in the grid has a nifty little card-flip on hover which displays a description of that benefit.

... unless you're using Firefox.

My version of Firefox (52) displays the boxes OK but when you hover on them it flips the SVG icons around (and the text), displays the backside only momentarily and then goes white.

Can anyone explain what I should do to make this grid compatible with Firefox.
As far as I know, all other browsers can see it fine.

Following is the html and code for each individual box.
Many thanks
Tim

HTML

<div class="flip-cards card-shadow rMargin">
  <div class="front-card">
    <div class="frow column-center">
        <div class="aSVGIcon">
              <svg class="[types field='svgscale' output='raw'][/types]" fill="#58595B" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0px" y="0px" viewBox="0 0 100 100" style="enable-background:new 0 0 100 100;" xml:space="preserve">[types field='svg-paths' output='raw'][/types]
              </svg>
        </div>
        <div class="cbenTitle">
                [wpv-post-title]
        </div>
    </div>
  </div>
  <div class="reverse-card" id="[wpv-post-id]">
    <p class="cbenText">[wpv-post-body view_template="None"]</p>
  </div>
</div>

Open in new window

CSS

.centerIt{
  margin: 0 auto; 
}
.rMargin{
  margin-right:5px; 
}
.flip-cards
{
    width:200px;
    height:200px;
    position:relative;
    /*background:#BBBDC0;*/
    /*margin-left:5px;*/
    /*margin-right:auto;*/
    -webkit-transition: all 1s ease;
    transition: all 1s ease;
    -moz-transition: all 1s ease;
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
}


.flip-cards:hover
{
    transform: rotateY( 181deg );
    -webkit-transform: rotateY(181deg);
    -moz-transform: rotateY(181deg);
    background:transparent;
}


.flip-cards div
{
    width:200px;
    height:200px;
    position:absolute;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
}

.front-card
{
    z-index: 2;
    background:#BBBDC0;
    position:relative;
    padding:0;
}

.reverse-card
{
    -webkit-transform: rotateY(181deg);
    transform: rotateY( 181deg );
    -moz-transform: rotateY( 181deg );
    background:#C64A4F;
    color:white;
    padding:10px;
}
.aSVGIcon{
}
.cbenTitle{
  margin-top:75%;
  color:#58595B;
  text-align:center;
  font-size:0.7em;
  text-transform:uppercase;
}
.asvgScale{
    transform: scale(0.5);
}
.lgScale{transform:scale(0.5);}
.mdScale{transform:scale(0.4);}
.smScale{transform:scale(0.3);}
.reverse-card p {
  font-size:0.8em; 
}

Open in new window