Positioning & Z-Index
The position property specifies the type of positioning method used for an element.
css
.static { position: static; } /* Default */
.relative { position: relative; }
.fixed { position: fixed; } /* Viewport */
.absolute { position: absolute; } /* Nearest positioned ancestor */
.sticky { position: sticky; top: 0; } /* Toggles relative/fixed */
/* Z-Index controls stack order */
.top { z-index: 10; }