Step 1: Open a website page where you want to change color.
Step 2:Right click on that part in which you want to change color.
Step 3:Click on inspect option.
Step 4: Find and click on that inspect line in which you want to change color : 
Step 5: copy that css rule
Step 6: Open Ftp/Cpanel
Step 7: Follow this path : /templates/cloudx/css and find overrides.css_new
Step 8: Remove (_new) and make overrides.css
Click for more information about rename css file
Step 9 : Click on edit file option on overrides.css
Step 10 : Copy CSS rule which is copied by you from inspect style page:
Step 11 : Change the color which color you want to change :
Step 12 : save and update file.
Step 13 : Open that web page and Hard reload that page, color will be reflected .
You can do this process for changing color of any part or any section which is you want .
