.s_button1{position:relative;overflow:hidden}.s_button1:before{content:"";position:absolute;display:block;transition:all .6s;width:100%;height:0;border-radius:50%;left:50%;top:50%;padding-top:100%;transform:translateX(-50%) translateY(-50%)}.s_button1:hover:before{animation:style1 .75s;z-index:1}@keyframes style1{0%{background:rgba(0,0,0,.25);transform:translateX(-50%) translateY(-50%) scale(0)}to{background:0 0;transform:translateX(-50%) translateY(-50%) scale(1)}}.s_button3{position:relative;overflow:hidden;background-color:#fff;opacity:1;color:#333;border:solid 1px #409ef4}.s_button3:hover{color:#fff;background-color:#66b1f6}.s_button4{position:relative;overflow:hidden;background-color:#fff;opacity:1;color:#333;border:solid 1px #409ef4}.s_button4::after{opacity:1;width:0}.s_button4:hover{color:#fff}.s_button4:hover::after{width:100%;background-color:#409ef4}*{font-family:Microsoft YaHei!important}