How to modify or change colors of Opencart 4 default template and themes

How to change the header colors for Opencart 4 or oc4 from the default template or themes.
Change the color of h1 h2 h3 h4 h5 h6 for opencart 4 or c4
change the color of the default opencart 4 themes or template.
Guide on how to change and modify colors for Opencart 4 or oc4
Change the background color of opencart 4 or oc4
Change the color of the open cart 4 breadcrumbs and the product title label
Modify color for Opencart 4 default template

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