.expand-item{overflow:hidden;background:#f4f4f4;margin-bottom:8px;padding:16px;border-radius:4px}.expand-enter-active{transition:max-height .4s cubic-bezier(.4,0,.2,1),opacity .4s}.expand-enter,.expand-leave-to{max-height:0;opacity:0}.expand-enter-to,.expand-leave{max-height:200px;opacity:1}.expand-leave-active{transition:max-height .4s cubic-bezier(.4,0,.2,1),opacity .4s}