Cal. Gov't Code § 84504.2

(a) A print advertisement designed to be individually distributed, including, but not limited to, a mailer, flyer, or door hanger, that is paid for by a committee, other than a political party committee or a candidate controlled committee established for an elective office of the controlling candidate, shall include the disclosures required by Sections 84502, 84503, 84506.5, and 84514, displayed as follows:
1. (1) The disclosure area shall have a solid white background and shall be in a printed or drawn box on the bottom of at least one page that is set apart from any other printed matter. All text in the disclosure area shall be in contrasting color and centered horizontally in the disclosure area.
2. (2) The text shall be in standard Arial Regular type with a type size of at least 10-point.
3. (3) The disclosure required by Section 84514, if any, shall appear at the top of the disclosure area, and shall be separated from the disclosures required by Sections 84502 and 84503 by a blank line.
4. (4) The disclosures required by Sections 84502 and 84503 shall follow the disclosure required by Section 84514. The text of the disclosure shall be underlined if there are any top contributors.
5. (5) The top contributors, if any, shall each be disclosed on a separate horizontal line separate from any other text, in descending order, beginning with the top contributor who made the largest cumulative contributions on the first line. The name of each of the top contributors shall be centered horizontally in the disclosure area and shall not be underlined. The names of the top contributors shall not be printed in a type that is condensed to be narrower than a normal non-condensed standard Arial Regular type.
6. (6) An advertisement supporting or opposing a candidate that is paid for by an independent expenditure shall include the disclosure required by Section 84506.5, which shall be underlined and on a separate line below any of the top contributors.
7. (7) A committee subject to Section 84223 shall next include the text “Funding Details At [insert link to Secretary of State internet website page with top 10 contributor lists],” which shall be underlined and printed on a line separate from any other text at the bottom of the disclosure area.
8. (8) Notwithstanding the definition of “top contributors” in paragraph (1) of subdivision (c) of Section 84501, newspaper, magazine, or other public print advertisements that are 20 square inches or less shall be required to disclose only the largest top contributor of fifty thousand dollars ($50,000) or more.
(b) A print advertisement that is larger than those designed to be individually distributed, including, but not limited to, a yard sign or billboard, paid for by a committee, other than a political party committee or a candidate controlled committee established for an elective office of the controlling candidate, shall include the disclosures pursuant to Section 84502, 84503, 84506.5, and 84514 in a printed or drawn box with a solid white background on the bottom of the advertisement that is set apart from any other printed matter. Each line of the written disclosures shall be in a contrasting color in standard Arial Regular type no less than 5 percent of the height of the advertisement, and shall not be condensed to be narrower than a normal non-condensed standard Arial Regular type. The text may be adjusted so it does not appear on separate horizontal lines, with the top contributors separated by a comma.
(c) Any text or image not required in this section shall not appear in the disclosure area, except as provided in Section 84504.8 and as otherwise authorized or provided by applicable law.