.toggled_content {
    height: 0;
    overflow: hidden;
    -webkit-transition: height 0.5s ease-out;
    -moz-transition: height 0.5s ease-out;
    -ms-transition: height 0.5s ease-out;
    -o-transition: height 0.5s ease-out;
    transition: height 0.5s ease-out;
}
.toggled_content.expanded {
    height: auto;
}