Alter Footer Widgets Title Border Color
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By default, the border color next to the Widgets Titles is controlled by your primary colors set in the Customizer > General Options > General Styling.
If you want to use a different color for the border next to the widgets titles in the footer area, use the following CSS snippet:
/* Footer Widgets Title Border Color */
#footer-widgets .footer-box .widget-title {
border-color: #fff;
}
Adjust the border-color value per your need.
All CSS snippets should be added via a child theme's style.css file or using the built-in Custom CSS panel.
Useful Link: HTML Color Picker