Checkout styling

Style your checkout to match Klarna's branding by integrating approved assets, configuring descriptors, and applying dynamic messaging for a consistent and localized payment experience.

Overview

This guideline outlines the available methods for styling Klarna elements within your checkout. A well-styled checkout creates a cohesive brand experience, builds customer trust, and improves conversion rates. By integrating Klarna's design elements consistently, you ensure customers recognize and feel confident using Klarna as a payment method.

You can retrieve and apply Klarna branding assets, configure payment method descriptors, and integrate dynamic messaging using Klarna's APIs. These styling options ensure your payment interface remains consistent, localized, and compliant with Klarna's design specifications.

Prerequisites

Before styling your checkout:

Implement Payment Presentation in your checkout flow
Set up the Klarna Payment SDK
Verify your integration environment is configured correctly

Logo

Klarna provides a set of logo variations that display Klarna within your payment form. When you mount the checkout, Payment Presentation dynamically retrieves these logos, ensuring the branding remains up to date and compliant with Klarna's visual guidelines.

Choosing the right logo

Select the logo shape that best fits your checkout layout and design:

Badge: Recommended for optimal clarity and brand recognition - effectively communicates the Klarna payment method
Rectangle: Useful for horizontal payment method displays
Square: Ideal for grid layouts or icon-based payment selectors

Klarna recommends using the badge for optimal clarity and brand recognition, as it more effectively communicates the option to pay with Klarna.

Badge

To retrieve the badge, set the shape attribute of the icon component to badge.

JAVASCRIPT

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try {
    const response = await Klarna.Payment.presentation({
        amount: 10000,
        currency: 'USD',
    });
    response.icon.component({
        shape: 'badge',
    }).mount('#icon-container');
} catch (e) {
    // Handle error e

Rectangle

To retrieve the rectangle icon, set the shape attribute of the icon component to rectangle.

JAVASCRIPT

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try {
    const response = await Klarna.Payment.presentation({
        amount: 10000,
        currency: 'USD',
    });
    response.icon.component({
        shape: 'rectangle',
    }).mount('#icon-container');
} catch (e) {
    // Handle error e

Square

To retrieve the square icon, set the shape attribute of the icon component to square.

JAVASCRIPT

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try {
    const response = await Klarna.Payment.presentation({
        amount: 10000,
        currency: 'USD',
    });
    response.icon.component({
        shape: 'square',
    }).mount('#icon-container');
} catch (e) {
    // Handle error e

Headers and messages

As outlined in the Payment Presentation overview, Klarna provides Acquiring Partners with a set of headers and customer-facing messages via the Payment Presentation. These messages are transparent, concise, and dynamically tailored to the specific customer and purchase context.

Mount each component to display the appropriate messaging:

JAVASCRIPT

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try {
    const response = await Klarna.Payment.presentation({
        amount: 10000,
        currency: 'USD',
    });
    response.header.component().mount('#header-container');
    response.subheader.component().mount('#subheader-container');
    response.message.component().mount('#message-container');
} catch (e) {
    // Handle error e

Style text-based components

The components don't include predefined styles. Apply custom styling by targeting individual elements using the selectors available in the rendered output. This provides full flexibility to adapt the presentation to match your checkout's visual design while maintaining the integrity of Klarna's messaging.

CSS

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[klarna-payment-header] {
    font-size: 16px;
}
[klarna-payment-subheader] {
    font-size: 16px;
}
[klarna-payment-message] {
    font-size: 16px;
}

Font selection

You can apply your site's font to Klarna elements to preserve brand consistency. However, for optimal legibility and alignment with Klarna's design standards, use a system font or a simple, readable typeface. If you use a custom font, avoid italic styles or any formatting that may reduce readability. Clarity must take precedence over stylistic choices.

Ensure sufficient font weight and size for readability across devices. Test your font choices on both desktop and mobile views.

Payment button

The Payment Presentation payment button is recognizable and helps customers understand what happens next, building confidence to proceed with their purchase. The button appears in the payment form once Klarna is selected.

Customize the button's appearance to match your site's design while maintaining Klarna's brand recognition. You can adjust three key aspects: theme, shape, and size.

Theme

The theme defines the button's color scheme. Select a theme that provides sufficient contrast with your checkout background.

Available themes:

Default (dark): Black button for light backgrounds - most recognizable by customers
Light: White button for dark backgrounds
Outlined: White button with black outline - versatile for various backgrounds

Default theme (dark)

The button's default theme color is dark. Since the theme attribute is optional, the default theme applies when you set the attribute to default or omit it entirely.

Don't use the default theme on black or dark backgrounds. Ensure sufficient contrast between the button and background for visibility and accessibility.

Klarna recommends using the default theme - it's widely recognized by Klarna customers and looks good on light backgrounds.

An image showing the Express checkout button in the default dark theme with a black background.

JAVASCRIPT

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Klarna.Payment.button({
    theme: "default", // Used to set the theme of the button
    ...
}).mount('#container')

Light theme

Use the light theme to make the button visible on dark backgrounds. To apply the light theme, set the theme attribute to light.

Don't use the light theme on white or light backgrounds. Ensure sufficient contrast between the button and background.

An image showing the Express checkout button in the light theme with a white background.

JAVASCRIPT

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Klarna.Payment.button({
    theme: "light", // Used to set the theme of the button to light
    ...
}).mount('#container')

Outlined theme

Use the outlined theme to make the button visible on all backgrounds. To apply this theme, set the theme attribute to outlined.

Don't place the outlined button on dark or saturated backgrounds. Ensure sufficient contrast for the outline to be visible.

An image showing the Express checkout button in the outlined theme with a black border and a white background.

JAVASCRIPT

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Klarna.Payment.button({
    theme: "outlined", // Used to set the theme of the button
    ...
}).mount('#container')

Button shape

Customize the button's shape to match your site's look and feel. This creates a visually cohesive and engaging customer experience. Control the button's shape by changing the value of the shape attribute.

Three shapes are available: default, rectangular, and pill.

Rounded corners (default)

The default button shape is a rectangle with rounded corners. To apply the default shape, set the shape attribute to default.

An image showing the Express checkout button in the default rectangular shape with rounded corners.

JAVASCRIPT

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Klarna.Payment.button({
    shape: "default", // Used to define the shape of the button
    ...
}).mount('#container')

Minimum corner radius

To apply the rectangular shape with square corners, set the shape attribute to rect.

JAVASCRIPT

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Klarna.Payment.button({
    shape: "rect", // Used to style the button with a rectangular shape with square corners
    ...
}).mount('#container')

Maximum corner radius

To apply the pill shape, set the shape attribute to pill.

An image showing the Express checkout button in the pill shape.

JAVASCRIPT

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Klarna.Payment.button({
    shape: "pill", // Used to style the button in a pill shape
    ...
}).mount('#container')

Consistency: Match the Klarna button's size, shape, and spacing with other payment buttons
Contrast: Always ensure sufficient contrast between button theme and background
Visibility: Place the Klarna logo and button prominently in your payment form
Testing: Test your styling across different devices and screen sizes
Brand compliance: Use only approved Klarna assets and follow the design guidelines

Troubleshooting

Button not displaying correctly

Verify the container element exists in the DOM before mounting
Check browser console for JavaScript errors
Ensure the Klarna SDK loaded successfully
Confirm the amount and currency parameters are valid

Styling not applied

Verify CSS selectors match the rendered elements
Check for CSS specificity conflicts with your site's stylesheets
Use browser developer tools to inspect the rendered components
Ensure CSS rules are loaded after the Klarna components mount

Logo or icon not appearing

Verify the shape parameter is one of: badge, rectangle, or square
Check the container element has sufficient space for the icon
Confirm the API response includes the icon component

Klarna in your checkout

Checkout styling

Overview

Prerequisites

Logo

Choosing the right logo

Badge

Rectangle

Square

Headers and messages

Style text-based components

Font selection

Payment button

Theme

Default theme (dark)

Light theme

Outlined theme

Button shape

Rounded corners (default)

Minimum corner radius

Maximum corner radius

Button size

Width

Height

Best practices

Troubleshooting

Button not displaying correctly

Styling not applied

Logo or icon not appearing