Hi @noelie33,
The Astra Support Forum might be the best place to ask your question; you might even find an answer there already, if another user had a similar question in the past.
In any case, you should be able indeed to achieve the desired behavior with some custom CSS. The below CSS can be used to achieve the results as shown in the attached screenshots, but feel free to modify it to your liking.
.ast-builder-menu-1 .menu-item>.menu-link {
line-height: 3em;
margin-top: 1em;
font-size: 1.2em;
}


Hope this helps!
Kind regards, Jarno