Resolve "Implement basic functionality"

Closes #1 (closed) Closes #2 (closed) Closes #3 (closed) Closes #4 (closed) Closes #5 (closed) Closes #6 (closed)

src/DragGrid.vue

@@ -279,7 +279,6 @@ export default {
 .highlight-container {
   display: none;
   transition: all 2s ease-in-out;
-  z-index: -1;
   pointer-events: none;
   user-select: none;
   width: 100%;