Ctrl 4 ought to do heading level 4.
Consider adding or editing the style="whatever" in the p tag. IMO really <b>, <i>, <strong> and <em> should only be used for a word or part of a word. A paragraph <p> or heading <hx> should have any styles, size, margin, or font defined in the CSS.
An aside. A heading shouldn't end with a period (full stop), usually either nothing, ? or ! Style guides differ on the : at the end of a heading.