style(Dialog): add message min-height (#7191)

src/dialog/Dialog.js

@@ -187,7 +187,7 @@ export default createComponent({
         };
 
         return (
-          <div class={bem('content')}>
+          <div class={bem('content', { isolated: !hasTitle })}>
             <div {...data} />
           </div>
         );

src/dialog/index.less

@@ -29,9 +29,18 @@
     }
   }
 
+  &__content {
+    &--isolated {
+      display: flex;
+      align-items: center;
+      min-height: 104px;
+    }
+  }
+
   &__message {
+    flex: 1;
     max-height: @dialog-message-max-height;
-    padding: @dialog-message-padding;
+    padding: 26px @dialog-message-padding;
     overflow-y: auto;
     font-size: @dialog-message-font-size;
     line-height: @dialog-message-line-height;
@@ -65,6 +74,7 @@
   &__confirm,
   &__cancel {
     flex: 1;
+    height: @dialog-button-height;
     margin: 0;
     border: 0;
   }
@@ -88,6 +98,11 @@
       color: @text-color;
     }
 
+    .van-dialog__confirm,
+    .van-dialog__cancel {
+      height: @dialog-round-button-height;
+    }
+
     .van-dialog__confirm {
       color: @white;
     }