.back[data-v-1a50fb2c]{position:fixed;top:5px;left:5px;width:25px;height:25px;border-radius:50%;font-size:30px;background-color:rgba(0,0,0,.5);z-index:10000}.van-icon[data-v-1a50fb2c]{font-size:14px!important}.letterSetting{box-sizing:border-box;height:calc(100vh - 40px);padding:20px;position:relative}.letterSetting .input{width:15%}.letterSetting .field{background-color:#f2f2f2;border-bottom:1px solid hsla(0,0%,80%,.7);padding-left:0;padding-right:0}.letterSetting .tip{margin:10px 0;color:rgba(0,0,0,.4)}.letterSetting .submit{width:100%;text-align:center}.letterSetting .btn{width:60%;height:36px;margin-top:20px}