.animateBlock {
    margin-top: 20px;
    display: inline-block;
    opacity: 0;
    filter: alpha(opacity=0);
    position: relative;
    -webkit-transition: all .5s ease-in;
    -moz-transition: all .5s ease-in;
    -ms-transition: all .5s ease-in;
    -o-transition: all .5s ease-in;
    transition: all .5s ease-in;
}
 
.animateBlock.left {
    left: -20%;
}
 
.animateBlock.right {
    right: -20%;
}
 
.left.animated {
    left: 0%;
    opacity: 1;
    filter: alpha(opacity=100);
}
 
.right.animated {
    right: 0%;
    opacity: 1;
    filter: alpha(opacity=100);
}