How can I improve the visual appeal of my product page menu?

Store Design
6

I don’t see the code in place.

But if you want them to be even closer to each other, add this code to the bottom of the theme.css file:

.product-block-list__item .card .card__collapsible-button {
  padding:0 20px;
}
@media screen and (min-width: 641px) {
  .product-block-list__item .card .card__collapsible-button {
     padding:0 30px;
  }
}

PS: add the previous code too.