#000000
The hex (colour) code - in HTML #RRGGBB format - for the colour black. This is most often used in programming.
<div style="font-size: large; font-family: sans-serif">
<p style="color: #000000; background-color: #ffffff">Hello, world!</p>
</div>
<p style="color: #000000; background-color: #ffffff">Hello, world!</p>
</div>
000000
why did you search this up again?
person 1: 000000
person 2: 111111
person 3: 222222
persons 1 and 2: 010101
person 3: *leaves*
person 2: 111111
person 3: 222222
persons 1 and 2: 010101
person 3: *leaves*