style: 调整表单样式

src/assets/css/base.css

@@ -167,8 +167,8 @@ input[type='search']::-webkit-search-cancel-button {
 .form textarea.van-field__control {
   height: 40px;
   padding: 0 10px;
-  border: 1px solid #ccc;
-  border-radius: 6px;
+  border: 1px solid #c9c9c9;
+  /* border-radius: 6px; */
 }
 .form .van-field__label {
   margin-bottom: 10px;