Note: The teal color is just used here as an accent color. The color of headings are contextually based.
H1 - Page Header
Helvetica Neue Light for IBM, 24px=1.500em
H2 - Card Header
Helvetica Neue Light for IBM, 18px=1.125em
H3 - ?
Helvetica Neue Light for IBM, 16px=1.000em
H4 - Section Header & Tab Headers
Helvetica Neue Light for IBM, 14px=0.875em
H5 - Table Header
Helvetica Neue Light for IBM, 12px=0.750em
Helvetica Neue Light for IBM, 14px=0.875em
Helvetica Neue Bold for IBM, 14px=0.875em
Body A
Helvetica Neue Light for IBM, 12px=0.750em
Body B
Helvetica Neue Roman for IBM, 12px=0.750em
Fineprint
Helvetica Neue Light for IBM, 10px=0.625em