if by top bar you mean this
it’s the Welcome link banner theme component
i have a customized version of it running on my forum
Above main container
mode:
Below site header
mode:
CSS code for the above result (not including the banner background image and icons, which are set in the component)
// banner links
.above-main-container-outlet.welcome-link-banner-connectors .welcome-wrapper .welcome-content,
.below-site-header-outlet.welcome-link-banner-connector .welcome-wrapper .welcome-content {
display: none;
}
.above-main-container-outlet.welcome-link-banner-connectors .welcome-wrapper .featured-banner-link,
.below-site-header-outlet.welcome-link-banner-connector .welcome-wrapper .featured-banner-link {
padding: 0em;
}
.above-main-container-outlet.welcome-link-banner-connectors .welcome-wrapper,
.below-site-header-outlet.welcome-link-banner-connector .welcome-wrapper {
width: 95%;
margin: 1.5em auto;
background: rgba(black, .8);
}
.above-main-container-outlet.welcome-link-banner-connectors .welcome-wrapper .featured-banner-link>div a .d-icon,
.below-site-header-outlet.welcome-link-banner-connector .welcome-wrapper .featured-banner-link>div a .d-icon {
margin-bottom: .2em;
}