How do I change the underline color?

Hi
How do i change the color of the underline on selected sites? I mean the red underline in my menu and in the footer?

Hi,

Thank you for contacting us about our theme, Sydney. I am happy to help with your queries.

Please try adding this CSS code to Appearance > Customize > Additional CSS from dashboard.

    #sidebar-footer .widget-title::after {
      background-color: #fff000;
    }

    #mainnav .current-menu-item {
      border-color: #fff000;
    }

Regards,
Kharis
aThemes Support