h5页面软键盘遮挡弹窗中的输入框
.floatbox{position:fixed; top:0; right:0; bottom:0; left:0; background:rgba(0,0,0,0.5);}
.floatbox>div{position:absolute; top:50%; left:15px; right:15px; transform:translate(0,-50%); -webkit-transform: translate(0,-50%); max-height:80%; overflow-y:auto; background:#fff; border-radius:5px;}