Hi there,
This is something that can be done with CSS when it is needed therefore we won’t be adding this to the theme.
Keep in mind that we only add options that are useful for the majority of the users in order to keep the theme and premium plugin lightweight and fast.
You can do something similar like this:
<div class="custom-notes">
notes content
</div>
and this CSS:
.custom-notes {
padding: 20px;
background-color: #333;
border: 1px solid #000;
}
Adding CSS: https://docs.generatepress.com/article/adding-css/