To change the colors for all modules click on the ‘Customizer Cog’ which appears next to each module when you hover over it. Then, on the left side a menu will appear with two options: ‘Edit this Module’ and ‘Edit all Modules’. You should click on the “Edit all Modules” button.
Under the ‘Edit all Modules’ tab you will find a few colors that were used the most within the template. Click on the colored rectangle and a color picker will appear. The color chosen will change in all the modules of the template when you save the settings. All settings will be saved when you will click on the “save” button.