Hi Donald,
Thanks for your question, you may be able to use something like:
.wp-block-categories-list .wp-block-categories .nav{
color: #1aa7ec !important;
}
It’s very hard to tell without the actually page URL which we can use to find the selectors. Callaway theme is considered one of our legacy theme and is nowhere near as feature rich as our flagship Crio Pro WordPress theme which you would use to easily make these adjustments, it’s also 100% compatible with BoldGrid Post and Page Builder. I just wanted to make you aware of “Crio” in the case you were interested in a more workable solution.
I hope this snippet works for you!