a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible,
.dropdown-toggle:focus-visible,
.navbar-toggle:focus-visible,
.carousel-control:focus-visible,
.dropdown-menu > .active > a:focus-visible {
    outline: 3px solid #0D6EFD !important;
    outline-offset: 2px !important;
}

/* keep the skip icon and the main container as designed */
main#main:focus {
    outline: none !important;
}