value, or relative lightness/ darkness, will set two elements apart. A worker climbs to the top of the crate. The search lights are trained on the door. The riflemen throw the bolts on their rifles and crack their stun guns, sending arcs of current cracking through the air. A worker climbs to the top of the crate. The search lights are trained on the door. The riflemen throw the bolts on their rifles and crack their stun guns, sending arcs of current cracking through the air. same value as text contrasting value A Heading For This Text Block A Heading For This Text Block p { color: rgb(128, 128, 128); } ! h1, h2, h3, h4, h5, h6 { color: rgb(0, 0, 0); }