#p1 {background-color: hsla(120, 100%, 50%, 0.3);}   /* green with opacity */
#p2 {background-color: hsla(120, 100%, 75%, 0.3);}   /* light green with opacity */
#p3 {background-color: hsla(120, 100%, 25%, 0.3);}   /* dark green with opacity */
#p4 {background-color: hsla(120, 60%, 70%, 0.3);}    /* pastel green with opacity */