Give max-width to sprite tiles to prevent long names issue

src/components/backpack/backpack.css

@@ -70,6 +70,7 @@
 
 .backpack-item {
     min-width: 4rem;
+    max-width: 6rem;
     margin: 0 0.25rem;
 }
 

src/components/sprite-selector/sprite-selector.css

@@ -31,6 +31,7 @@
     */
     box-sizing: border-box;
     width: calc((100% / $sprites-per-row ) - $space);
+    max-width: 6rem;
     min-width: 4rem;
     min-height: 4rem; /* @todo: calc height same as width */
     margin: calc($space / 2);