example(stepper): fix demo style bug

components/_style/mixin/theme.components.styl

@@ -300,7 +300,7 @@ selector-active-color = color-primary
 selector-zindex = 1102
 
 // stepper
-stepper-fill = color-primary-background
+stepper-fill = color-bg-base
 stepper-disabled-opacity = opacity-disabled
 stepper-color = color-text-base
 stepper-font-size = font-body-large

components/stepper/demo/index.vue

@@ -1,6 +1,8 @@
 <template>
   <div class="md-example stepper">
     <section class="md-example-section" v-for="(demo, index) in demos" :key="index">
+      <div class="md-example-title" v-html="demo.title || '基础'"></div>
+      <div class="md-example-describe" v-html="demo.describe"></div>
       <div class="md-example-content">
         <component :is="demo"></component>
       </div>
@@ -22,8 +24,5 @@ export default {...createDemoModule('stepper', [Demo0, Demo1, Demo2, Demo3, Demo
 <style lang="stylus" scoped>
 .md-example-section
   position relative
-  margin 0 !important
   hairline(bottom, color-border-base)
-.md-example-content
-  margin 0 !important
 </style>