Sticky header may hide focused elements - WCAG 2.2 violation
WCAG 2.2 (the Web Content Accessibility Guidelines) includes a criterion, Focus Not Obscured, which expects that when a keyboard user tabs to a button or input field, that element is not entirely hidden behind a sticky header or footer. Whether WCAG 2.2 is legally required depends on your jurisdiction. This site appears to have a sticky header without the scroll adjustment needed to prevent this.
Why this matters
Keyboard users, including people who cannot use a mouse, may find that input fields or buttons disappear under your fixed navigation bar when they tab to them. This is an accessibility barrier, and accessibility laws in some jurisdictions refer to WCAG, so check with a legal adviser whether any apply to you.
How to fix it
Ask your developer to add scroll-margin-top to your main content elements, set to a value equal to or greater than the height of your sticky header. This is a small CSS change that ensures focused items scroll into full view.
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