Comment posted to WordPress SEO Theme Talian 5 with AdSense/Clickbank Ads by WordPress SEO Theme Author.
Your site https://fitnslim.org/ hasn’t got changed images, so though you’ve made CSS changes (edited the style.css file) you’ve not changed the actual image files to get a different look like I did at https://www.skegness-attractions.co.uk/
You have to go into the theme folder that you unzipped onto your computer.
Find the images under (this is offline, not on your website, probably on your C:\ drive),
\talian-adsense-seo-04\images\
In the folder on your hard drive you’ll find over 20 images. The important ones are:
headerbg.gif : the image for the header, black background with an orange and green stripe
footerbg.gif : the image for the footer, black background
h2navbg.gif : the image for the sidebar headings, black background with an orange and green stripe
You’ll need image editing software like PainshopPro or Photoshop (any program that can edit gif images) load these images into an image editing program and edit them.
The images are really simple, the footer one is all black, so replace the black with your choice of colour. The other two have a block of green at the top and orange at the bottom, rest is black with a little colour grading on the header image. Replace the black, green and orange bits with your choice of colour.
Save the three files and upload them over the images online using FTP (upload the whole theme, it’s easier). Make sure you refresh the page to check it’s worked in a browser (CTRL F5 usually works, if not clear your browser cache).
You could also change search_button.gif (the orange search button image). commented_v.gif the number of comments button.
Any other colour changes are through the style.css file that it looks like you’ve already figured out how to edit.
BTW if you want to pinch the blue images at https://www.skegness-attractions.co.uk/ feel free, easy to do download the images one by one from
https://www.skegness-attractions.co.uk/wp-content/themes/talian-adsense-seo-04/images/
Wouldn’t bother me, but my wife (it’s her site) might slap you 
David
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