Fixed page header overlaps in-page anchors

Question

If you can’t or don’t want to set a new class, add a fixed-height ::before pseudo-element to the :target pseudo-class in CSS:

:target::before {
  content: "";
  display: block;
  height: 60px; /* fixed header height*/
  margin: -60px 0 0; /* negative fixed header height */
}

Or scroll the page relative to :target with jQuery:

var offset = $(':target').offset();
var scrollto = offset.top - 60; // minus fixed header height
$('html, body').animate({scrollTop:scrollto}, 0);