Hi,

Please go to Appearance > Customize:

• - Homepage > Color, scroll Home Title Box section
• - Sidebar > Color,
• - Logo & Header > Color,
• - Footer > Color,

You should adjust all the colors on each panel to test your site. The customizer features of WordPress will live preview immediately after you made a change. Your change on Customize will not save and only validate for preview purposes until you click the Publish button.

Best Regards,
PenciDesign.