Anchor links when clicked is chopped off by header

Hi, can the experts help me out here, when I click on any anchor links (try the icon buttons on the sidebar), it jumps to element but is chopped off/covered by header(I used basic template with a sticky header), how do I fix this or add height to it so it properly displays after the header?

It’s supposed to jump/scroll to the title of each clicked element

Click on link below

MG EXIA BLUE TRANS-AM - Showcase: Masterpiece - Kenzbuilds: All About Gundam Modelling 2.0

Many thanks