BACKGROUND
RED, GREEN, BLUE, TRANSPARENCY (default 100)
Set the background colour.
Example
PALETTE ,"text"
BACKGROUND 255,255,255,50
COLOR 255,0,0
END PALETTE
PRINT "kytschBASIC",,"text"
Output
<style>#text{
background-color: rgba(255,255,255,0.5) !important;
color: rgba(255,0,0,1) !important;
}</style>
<span id='text'>kytschBASIC</span>
Example
kytschBASIC