love.graphics.setBackgroundColor
Sets the background color.
love.graphics.setBackgroundColor( red, green, blue, alpha )
red number The red component (0-1).
green number The green component (0-1).
blue number The blue component (0-1).
alpha (1) number The alpha component (0-1).
love.graphics.setBackgroundColor( rgba )
rgba table A numerical indexed table with the red, green, blue and alpha values as numbers. The alpha is optional and defaults to 1 if it is left out.