Tips for Pairing Red and Navy | Give the Two Colors Different Roles on a Light Background

Red and navy can work together on a web page when you want clear information and a noticeable action. But filling headings, backgrounds, and buttons with both dark colors can make the screen feel crowded and leave visitors unsure where to look first. One approach is to keep most of the page light, use navy to structure the content, and reserve red for selected points of emphasis. Here are two arrangements for a fictional community course registration page.

Give navy the job of organizing information and red the job of prompting action

Start by separating course titles, dates, and descriptions from actions such as registration. Assign navy to headings and information groups, and use red mainly for the registration button or a written deadline notice. The colors do not need to alternate across equally large areas. With a light background, each dark color can have a clear role without occupying much space.

For these examples, choose navy ■#243750 and red ■#B53643. A HEX code identifies a web color using a hash sign and hexadecimal digits, commonly in a six-digit form. Red and navy belong to different hues, or color families, but that does not guarantee enough lightness difference between them. Decide what background each piece of text will appear on, not just which two colors look good beside one another.

Compare two layouts for a community course registration page

Warm off-white background, navy headings, and a red button

Use off-white ■#FAF7F2 for the overall background, navy ■#243750 for the course title, and deep gray ■#333943 for descriptions. The contrast ratios against the background are approximately 11.31:1 for the heading and 10.87:1 for body text. Supporting information, such as the time or venue, can use slightly softer ■#4B5665 while still providing about 6.97:1 contrast against the same background.

Fill only the “Register for This Course” button with red ■#B53643 and give it a white ■#FFFFFF text label. The text contrasts with the red button at about 5.88:1, while the button fill contrasts with the surrounding off-white ■#FAF7F2 at about 5.50:1. If the deadline also needs emphasis, write an explicit label such as “Registration closes: [date]” in dark red ■#AF3544. This text has about 5.75:1 contrast with the off-white background. The words communicate the deadline; red alone should not carry that meaning.

Pale blue-gray background with separate white information cards

For a list of several courses, set the page background to pale blue-gray ■#EFF3F7 and place each course on a white ■#FFFFFF card. The two light surfaces contrast at only about 1.12:1, so add a thin blue-gray ■#64748B border if the card needs a visible outline. This border has about 4.27:1 contrast with the surrounding page and 4.76:1 with the white card.

Keep course headings in navy ■#243750 and descriptions in deep gray ■#333943. Against the white card, their text contrast ratios are about 12.09:1 and 11.62:1. Use the same red ■#B53643 button with white ■#FFFFFF lettering on every card to make the same action visually consistent. The red button also contrasts with the white card at about 5.88:1, helping visitors find the registration control within each information group.

Avoid red text on navy and check both readability and status cues

Directly placing red ■#B53643 text on a navy ■#243750 background produces only about 2.06:1 contrast. Although the hues are different, this is not enough contrast for ordinary text. If you need lettering on a navy band, use white ■#FFFFFF instead; its contrast with the navy is about 12.09:1. Reserve red for text on a sufficiently light background or for a button with a clearly contrasting label.

Under the Web Content Accessibility Guidelines (WCAG) 2.2, Level AA, normal-size text generally needs a contrast ratio of at least 4.5:1 against its background, while qualifying large text needs at least 3:1. Essential non-text visual information that identifies an interface control, such as a required boundary, generally needs at least 3:1 contrast with adjacent colors. The numbers here were calculated separately for the stated opaque color pairs and do not establish that the entire page meets accessibility requirements.

On phones, check that people can follow the course name, date, and registration button in the intended order. Do not use red as the only indication of a state such as “Registration Closed”; include the wording itself. HueRoll lets you enter HEX codes, explore lighter and darker shades and palette suggestions, and check a selected color against white and black. It does not automatically compare arbitrary pairs of colors or determine WCAG AA compliance. Keeping the background light and each of the two colors in a consistent role can make the page easier to scan.