How can I change the 'pivot-point' of this flip animation? - css

Question

I've been playing around with this CSS3 Animation, but I can't get it to pivot from a different location than the middle.
It is an animation that causes a flip-like effect from the middle where the top-half goes into the negative z-axis and the bottom-half goes into the positive z-axis.
I am trying to get the pivot-point to be the top so as the element that this animation is applied to is transformed, the entire element goes into the positive z-axis.
And then the flipOut animation would just be the reverse of that.
I'd appreciate any help in getting this animation to behave as I described.
Here is the code that runs the animation right now:
.animated {
-webkit-animation-fill-mode: both;
-moz-animation-fill-mode: both;
-ms-animation-fill-mode: both;
-o-animation-fill-mode: both;
animation-fill-mode: both;
-webkit-animation-duration: 0.6s;
-moz-animation-duration: 0.6s;
-ms-animation-duration: 0.6s;
-o-animation-duration: 0.6s;
animation-duration: 0.6s;
}
#-webkit-keyframes flipInX {
0% {
-webkit-transform: perspective(400px) rotateX(90deg);
opacity: 0;
}
40% {
-webkit-transform: perspective(400px) rotateX(-10deg);
}
70% {
-webkit-transform: perspective(400px) rotateX(10deg);
}
100% {
-webkit-transform: perspective(400px) rotateX(0deg);
opacity: 1;
}
}
#-moz-keyframes flipInX {
0% {
-moz-transform: perspective(400px) rotateX(90deg);
opacity: 0;
}
40% {
-moz-transform: perspective(400px) rotateX(-10deg);
}
70% {
-moz-transform: perspective(400px) rotateX(10deg);
}
100% {
-moz-transform: perspective(400px) rotateX(0deg);
opacity: 1;
}
}
#-o-keyframes flipInX {
0% {
-o-transform: perspective(400px) rotateX(90deg);
opacity: 0;
}
40% {
-o-transform: perspective(400px) rotateX(-10deg);
}
70% {
-o-transform: perspective(400px) rotateX(10deg);
}
100% {
-o-transform: perspective(400px) rotateX(0deg);
opacity: 1;
}
}
#keyframes flipInX {
0% {
transform: perspective(400px) rotateX(90deg);
opacity: 0;
}
40% {
transform: perspective(400px) rotateX(-10deg);
}
70% {
transform: perspective(400px) rotateX(10deg);
}
100% {
transform: perspective(400px) rotateX(0deg);
opacity: 1;
}
}
.flipInX {
-webkit-backface-visibility: visible !important;
-webkit-animation-name: flipInX;
-moz-backface-visibility: visible !important;
-moz-animation-name: flipInX;
-o-backface-visibility: visible !important;
-o-animation-name: flipInX;
backface-visibility: visible !important;
animation-name: flipInX;
}
#-webkit-keyframes flipOutX {
0% {
-webkit-transform: perspective(400px) rotateX(0deg);
opacity: 1;
}
100% {
-webkit-transform: perspective(400px) rotateX(90deg);
opacity: 0;
}
}
#-moz-keyframes flipOutX {
0% {
-moz-transform: perspective(400px) rotateX(0deg);
opacity: 1;
}
100% {
-moz-transform: perspective(400px) rotateX(90deg);
opacity: 0;
}
}
#-o-keyframes flipOutX {
0% {
-o-transform: perspective(400px) rotateX(0deg);
opacity: 1;
}
100% {
-o-transform: perspective(400px) rotateX(90deg);
opacity: 0;
}
}
#keyframes flipOutX {
0% {
transform: perspective(400px) rotateX(0deg);
opacity: 1;
}
100% {
transform: perspective(400px) rotateX(90deg);
opacity: 0;
}
}
.flipOutX {
-webkit-animation-name: flipOutX;
-webkit-backface-visibility: visible !important;
-moz-animation-name: flipOutX;
-moz-backface-visibility: visible !important;
-o-animation-name: flipOutX;
-o-backface-visibility: visible !important;
animation-name: flipOutX;
backface-visibility: visible !important;
}

Answer 1

Set the transform origin:
transform-origin : center top;
Per MDN docs:
transform-origin: x-offset /* One-value syntax */ E.g. transform-origin: 2px
transform-origin: offset-keyword E.g. transform-origin: bottom
transform-origin: x-offset y-offset /* Two-value syntax */ E.g. transform-origin: 3cm 2px
transform-origin: y-offset x-offset-keyword E.g. transform-origin: 2px left
transform-origin: x-offset-keyword y-offset E.g. transform-origin: left 2px
transform-origin: x-offset-keyword y-offset-keyword E.g. transform-origin: right top
transform-origin: y-offset-keyword x-offset-keyword E.g. transform-origin: top right
transform-origin: x-offset y-offset z-offset /* Three-value syntax */ E.g. transform-origin: 2px 30% 10px
transform-origin: y-offset x-offset-keyword z-offset E.g. transform-origin: 2px left 10px
transform-origin: x-offset-keyword y-offset z-offset E.g. transform-origin: left 5px -3px
transform-origin: x-offset-keyword y-offset-keyword z-offset E.g. transform-origin: right bottom 2cm
transform-origin: y-offset-keyword x-offset-keyword z-offset E.g. transform-origin: bottom right 2cm