This is one approach to applying a particular colour setting from colour palettes to a custom element, to make sure that element fits any selected palette:
```
<$let couleur={{{ [[$:/palette]get[text]getindex[sidebar-tiddler-link-foreground]] }}}>
<style>
.couleur {color:<<couleur>>;text-decoration:underline;text-decoration-color:<<couleur>>}
</style>
<$button message="tm-modal" param={{!!title}} class="tc-btn-invisible couleur" >{{!!title}}</$button>
</$let>
```