H1 = 2em
H2 = 1.5em
h3 = 1.17em
h4 = 1em
h5 = 0.83em
h6 = 0.67em
Those are the default sizes that h? should be. As to what you want, that can be set in CSS. A CSS size of 100% is meaningless as that's 100% of the default size for that program. If you use font-size: 1.5em; you get the correct default size. The other thing you could do if you want smaller is to use <h3> instead of <h2>.
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