Scroll Bars 
::-webkit-scrollbar { }
::-webkit-scrollbar-track { } 
::-webkit-scrollbar-thumb { }
::-webkit-scrollbar-thumb:hover { }

div::-webkit-scrollbar { }

Create custom scrollbars for page or elements. Can use different styling properties.

Scroll CSS
scroll-behavior 
scroll-behavior: smooth;

Sets the behavior when scroll is triggered.

Scroll CSS
scroll-snap 
scroll-snap-align: ; start end center // how you want snapped item positioned 
scroll-snap-type: ; x mandatory, y proximity, both mandatory  // used on container to set snap control 
scroll-snap-stop: ; normal always // always - scroll container always stops at possible snap positions

Set snap positions on scrolls.

Scrolls CSS
overflow 
overflow: ;   // both
overflow-x: ; // horizontal only
overflow-y: ; // vertical only

Values:
visible
hidden
clip
scroll
auto

When content doesn't fit, make it scrollable.

Scroll CSS