Fix position from absolute to fixed, so it moves with the viewport when horizonally scrolling.
Fix card top border due to changing position, adjust top border px to 82px
Fix cards not showing up properly in ModernDark theme, when more lists are created than will fit on a single screen, inciting a horizontal scrollbar, and then scrolling across trying to open cards.
Due to position being absolute, this then opened the card off-screen
Commented out not in use font Poppins.
Custom fonts were previously removed because they did not work,
there were errors at browser inspect console.
Thanks to Meeques and xet7 !
Fixes#4451
