@keyframes opacity_left{
    0% {transform:translateX(-20%); opacity:0;}
    100% {transform:translateX(0); opacity:1;}
}
@-webkit-keyframes opacity_left{
    0% {-webkit-transform:translateX(-20%); opacity:0;}
    100% {-webkit-transform:translateX(0); opacity:1;}
}
@-moz-keyframes opacity_left{
    0% {-moz-transform:translateX(-20%); opacity:0;}
    100% {-moz-transform:translateX(0); opacity:1;}
}