anchor scroll gap code example
Example 1: page anchor tag below header
// For modern browsers, just add the CSS3 :target selector to the page.
// This will apply to all the anchors automatically.
// ref: http://stackoverflow.com/a/21707103/6220029
:target {
display: block;
position: relative;
top: -120px;
visibility: hidden;
}
Example 2: offset anchor tag when scrolling
a.anchor {
display: block;
position: relative;
top: -250px;
visibility: hidden;
}