Improve the footer layout.

Author: antoniandre

src/app.vue

@@ -16,9 +16,9 @@ w-app(:class="{ ready }" v-scroll="onScroll")
 
   footer.py2(color="white")
     w-flex.max-widthed(wrap justify-center)
-      .xs12.sm6.text-center.sm-text-left.copyright.
+      .xs12.sm6.text-center.smu-text-left.copyright.
         Copyright © {{ (new Date()).getFullYear() }} Antoni André, all rights reserved.
-      .xs12.sm6.text-center.sm-text-right.made-with
+      .xs12.sm6.text-center.smu-text-right.made-with
         .mb1 This documentation is made with #[w-icon fab fa-vuejs], #[w-icon fab fa-html5], #[w-icon fab fa-css3], #[w-icon fab fa-sass] & #[w-icon.heart material-icons favorite]
         | View this project on #[a(href="https://github.com/antoniandre/vueper-slides" target="_blank") #[w-icon fab fa-github] Github].
 </template>