refac: styling

src/app.css

@@ -100,3 +100,14 @@ select {
 	-ms-overflow-style: none; /* IE and Edge */
 	scrollbar-width: none; /* Firefox */
 }
+
+input::-webkit-outer-spin-button,
+input::-webkit-inner-spin-button {
+	/* display: none; <- Crashes Chrome on hover */
+	-webkit-appearance: none;
+	margin: 0; /* <-- Apparently some margin are still there even though it's hidden */
+}
+
+input[type='number'] {
+	-moz-appearance: textfield; /* Firefox */
+}