Remove box-sizing: content-box on sprite highlight

src/components/stage/stage.css

@@ -133,7 +133,6 @@ to adjust for the border using a different method */
 }
 
 .frame {
-    box-sizing: content-box !important;
     background: $motion-transparent;
     border: 2px solid $motion-primary;
     border-radius: 0.5rem;