.collapsible{background-color:#555;display:block;color:white;cursor:pointer;padding:18px;width:1000px;margin-left:auto;margin-right:auto;text-align:center;outline:0;font-size:15px;line-height:2}.active,.collapsible:hover{background-color:#555}.content{width:1000px;margin-left:auto;margin-right:auto;padding:0 18px;max-height:0;overflow:hidden;transition:max-height .2s ease-out;background-color:#f1f1f1}