Sorry missed webkit transform, change to:
.side-slideout-left-open #container {
-webkit-transform: translate3d(700px,0,0);
transform: translate3d(700px,0,0);
}
.sf-side-slideout {
width: 700px;
}
.side-slideout-right-open #container {
transform: translate3d(-700px, 0px, 0px);
-webkit-transform: translate3d(-700px, 0px, 0px);
}
– Kyle