Background size is not working in iphone mail

The pesky iPhone Mail app!

Background size not working in iPhone Mail is a known issue, and there are a few possible reasons for this:

  1. iOS limitations: The iPhone Mail app has some limitations when it comes to CSS styles, including background images. Specifically, the background-size property is not supported in the Mail app.
  2. Email client limitations: The Mail app uses a custom email client that doesn't support all CSS styles, including background-size. This is because the app is designed to prioritize simplicity and speed over advanced styling features.
  3. Image scaling: Even if background-size is supported, the Mail app may not scale the background image correctly, which can lead to distorted or cropped images.

To work around this issue, you can try the following:

  1. Use a different email client: If you're using a third-party email client like Gmail or Outlook, you may have more control over CSS styles, including background-size.
  2. Use a fallback image: Provide a fallback image that doesn't rely on background-size. You can use the background-image property instead, and set the image size using the width and height attributes.
  3. Use a different approach: Instead of using a background image, consider using a CSS gradient or a solid color as a background. This can be a good alternative if you need to maintain a consistent design across different email clients.
  4. Test and optimize: Test your email design in different email clients, including the iPhone Mail app, and optimize your design accordingly. You may need to make compromises on design elements that don't work well in the Mail app.

Here's an example of how you can use a fallback image without background-size:

body {
  background-image: url('image.jpg');
  background-size: cover; /* not supported in iPhone Mail */
  background-size: 100% 100%; /* fallback */
  width: 100%;
  height: 100%;
}

In this example, the background-size property is set to cover, but the background-size: 100% 100% fallback is used to ensure the image is displayed correctly in the iPhone Mail app.