.hidden-wrapper{overflow:hidden;-webkit-transition:all 400ms ease-in;-moz-transition:all 400ms ease-in;-ms-transition:all 400ms ease-in;-o-transition:all 400ms ease-in;transition:all 400ms ease-in}.hidden-wrapper.off{height:auto;max-height:0;opacity:0}.hidden-wrapper:not(.off){max-height:1000px;opacity:1}