Color is not claimed as a feature of the mark.
The mark consists of "NTER" in capital letters in bold font. The letters are underlined by a thick line which forms a sharp 90 degree corner below the lower left corner of the letter "N", and continues upwards vertically through a second 90 degree angle, and then horizontally to another 90 degree angle to create a door frame above the letters "NT". The thick line which forms the door frame terminates directly above the "T", without contacting the "T". Inside this doorframe, there is a door that is partially opened, with a door knob, and a darker background which is shaded to give the opening between the doorway and the partially opened door the appearance of an entrance into a room. There is a light border around the entire mark, which creates a shadow effect.
ENTER