fix: change transition-duration to make animate smoothly (#294)

src/components/Page/src/PageFooter.vue

@@ -41,7 +41,7 @@
     border-top: 1px solid #f0f0f0;
     box-shadow: 0 -6px 16px -8px rgba(0, 0, 0, 0.08), 0 -9px 28px 0 rgba(0, 0, 0, 0.05),
       0 -12px 48px 16px rgba(0, 0, 0, 0.03);
-    transition: width 0.4s;
+    transition: width 0.2s;
 
     &__left {
       flex: 1 1;