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Sometimes it may be preferable to use CSS classes rather than inline styles. react-modal can be configured to use CSS classes to style the modal content and overlay, as well as the document body and the portal within which the modal is mounted.

For the content and overlay

You can use the className and overlayClassName props to control the CSS classes that are applied to the modal content and the overlay, respectively. Each of these props may be a single string containing the class name to apply to the component.

Alternatively, you may pass an object with the base, afterOpen and beforeClose keys, where the value corresponding to each key is a class name. The base class will always be applied to the component, the afterOpen class will be applied after the modal has been opened and the beforeClose class will be applied after the modal has requested to be closed (e.g. when the user presses the escape key or clicks on the overlay).

Please note that the beforeClose class will have no effect unless the closeTimeoutMS prop is set to a non-zero value, since otherwise the modal will be closed immediately when requested. Thus, if you are using the afterOpen and beforeClose classes to provide transitions, you may want to set closeTimeoutMS to the length (in milliseconds) of your closing transition.

If you specify className, the default content styles will not be applied. Likewise, if you specify overlayClassName, the default overlay styles will not be applied.

If no class names are specified for the overlay, the default classes ReactModal__Overlay, ReactModal__Overlay--after-open and ReactModal__Overlay--before-close will be applied; the default classes for the content use the analogous prefix ReactModal__Content. Please note that any styles applied using these default classes will not override the default styles as they would if specified using the className or overlayClassName props.

For the document.body and html tag

You can override the default class that is added to document.body when the modal is open by defining a property bodyOpenClassName.

The bodyOpenClassName prop must be a constant string; otherwise, we would require a complex system to manage which class name should be added to or removed from document.body from which modal (if using multiple modals simultaneously). The default value is ReactModal__Body--open.

bodyOpenClassName when set as null doesn't add any class to document.body.

bodyOpenClassName can support adding multiple classes to document.body when the modal is open. Add as many class names as you desire, delineated by spaces.

One potential application for the body class is to remove scrolling on the body when the modal is open. To do this for all modals (except those that specify a non-default bodyOpenClassName), you could use the following CSS:

.ReactModal__Body--open {
    overflow: hidden;

You can define a class to be added to the html tag, using the htmlOpenClassName attribute, which can be helpeful to stop the page to scroll to the top when open a modal. The default value is null.

This attribute follows the same rules as bodyOpenClassName, it must be a constant string;

Here is an example that can help preventing this behavior:

.ReactModal__Html--open {
  overflow: hidden;

For the entire portal

To specify a class to be applied to the entire portal, you may use the portalClassName prop. By default, there are no styles applied to the portal itself.