轉自 https://www.itsupportguides.com/tech-tips-tricks/how-to-offset-anchor-tag-link-using-css/
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How to offset anchor tag link using CSS – NO JAVASCRIPT required
If your website has a fixed header you may have noticed that anchor tag links don’t work perfectly. When a user clicks on the anchor tag link the location of the anchor becomes hidden behind the fixed header, hiding the first part of the content.
To fix this you can add the following to your CSS style sheet.
This method does not involve any JavaScript, or classes manually added to each anchor.
:target:before {
content:"";
display:block;
height:90px; /* fixed header height*/
margin:-90px 0 0; /* negative fixed header height */
}
Note: 90px is the height of the fixed header plus margin and padding. You will need to adjust this to the size of your fixed header.
Before:
After:
Reference: http://stackoverflow.com/questions/4086107/html-positionfixed-page-header-and-in-page-anchors
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