.btn-m1{position:fixed;width:80px;height:80px;line-height:63px;bottom:80px;left:25px;border-radius:50px;z-index:100;transition:all 300ms ease}.btn-m2{position:fixed;width:80px;height:160px;line-height:63px;bottom:80px;left:25px;border-radius:50px;z-index:100;transition:all 300ms ease}.btn-s2{position:fixed;width:80px;height:160px;line-height:63px;bottom:80px;left:25px;border-radius:50px;z-index:100;transition:all 300ms ease}