.payment{overflow: hidden; line-height: 50px; padding-left: 15px; background: #fff;}
.payment>span{width: 28%;float: left;}
.payment input{width:70%;height: 40px;line-height:20px; border: none; display: inline-block;}
button{position: fixed; bottom: 0; z-index: 5; width: 100%; height: 50px; border: 0; line-height: 50px; text-align: center; font-size: 16px; color: #FFF;}