.panel__head{padding:0;border:0;cursor:pointer;background-color:transparent;appearance:none;-moz-appearance:none;-webkit-appearance:none}.panel__body{overflow:hidden;-webkit-overflow-scrolling:touch;transition:height .3s ease-in-out}.panel__content{opacity:0;transition:opacity .3s ease-in-out}.panel[aria-expanded=true] .panel__content{opacity:1}