Is there a way to customize the style (color, font-size, height) of lighting toast? I'm trying with css but have no success.

  • Are you referring to force:showToast or standard toast messages that you see in standard Lightning Experience? – Jayant Das May 30 at 16:16
  • It's force:showToast – Nitta May 30 at 16:28

Based on your comments, as you are using force:showToast, you won't be able to custom style the component. The Specification tab on the documentation provides the attributes that you can utilize for the look and feel of the component which is mainly using key, mode and type attributes.

You will need to create a custom toast message based on SLDS for your use case where you can utilize custom CSS.

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