Hello @iz29,
You should not make any modifications directly in your original theme file.
If you do so then all of your work will be lost upon update to the latest release of the theme.
So if you have to make any code customization then please go through the child theme and for adding the additional CSS, add them in Admin Panel > Appearance > Customize > Additional CSS.
Also, we are developing the pro version of the theme including the varieties of color option and for that, you have to wait a little while.
If you have any query further, please post them directly in our official support forum given below:
Travel Log Theme Support Forum: https://wptravel.io/support-forum/forum/travel-log/
Thank you .
Best Regards!!