[improvement] update color variables (#2010)

packages/submit-bar/demo/index.vue

@@ -35,7 +35,7 @@
       >
         <van-checkbox v-model="checked">{{ $t('check') }}</van-checkbox>
         <span slot="tip">
-          {{ $t('tip2') }}<span class="van-edit-address" @click="onClickLink">{{ $t('tip3') }}</span>
+          {{ $t('tip2') }}<span class="edit-address" @click="onClickLink">{{ $t('tip3') }}</span>
         </span>
       </van-submit-bar>
     </demo-block>
@@ -83,13 +83,15 @@ export default {
 </script>
 
 <style lang="postcss">
+@import '../../vant-css/src/common/var.css';
+
 .demo-submit-bar {
   .van-submit-bar {
     position: relative;
   }
 
-  .van-edit-address {
-    color: #38f;
+  .edit-address {
+    color: $blue;
   }
 
   .van-checkbox {