侧边栏 z-index值增大

@@ -7,7 +7,7 @@
     left: 0;
     right: 100rem / $pxConvertRem;
     width: 540rem / $pxConvertRem;
-    z-index: 1;
+    z-index: 4;
     overflow: hidden;
     @include transition(all .3s);
 
@@ -188,4 +188,4 @@
     display: block;
     @include transform(translateX(0));
     @include transition(transform 0.3s);
-}
\ No newline at end of file
+}