Bootstrap 2,007 sets <h1> to <h6> at 2.5, 2, 1.75, 1.5, 1.25 and 1 rem with a font weight of 500. The classes .h1 to .h6 apply the same styling to any element, so a sidebar title can keep its place in the outline yet look small: <h2 class="h5">. For hero text, .display-1 to .display-6 are larger (5rem down to 2.5rem) and lighter (weight 300). Blockquote renders these classes.