fix(开鲁水查查)：缴费样式调整

shuichacha-for-KL/pages/payment/payment.wxml

@@ -47,7 +47,7 @@
       <view class="input">
         <image class="shuidi" src="/static/img/icon_shuidi.png"></image>
         <input type="number" maxlength="4" value="{{volume}}" bindinput="setAmount" placeholder="{{amountTip}}"
-          placeholder-style="font-size:30rpx" />
+          placeholder-style="font-size:30rpx;color:rgba(66, 70, 86, 0.4)" />
         <text class="unit">吨</text>
       </view>
       <view class="tags">

shuichacha-for-KL/pages/payment/payment.wxss

@@ -2,10 +2,11 @@
 .payment {
   background-color: #FAFCFF;
   padding: 40rpx 40rpx 0;
-  position: absolute;
+  position: fixed;
   top: 0;
   left: 0;
   height: 100%;
+  overflow: auto;
 }
 
 .payment .card {
@@ -203,6 +204,7 @@
   display: flex;
   align-items: center;
   justify-content: center;
+  margin-bottom: 40rpx;
 }
 
 .payment .nav .line {