Dawn Theme - Change Banner Height in Mobile Version Only

Topic summary

A user is attempting to modify their Shopify Dawn theme to make the mobile banner display at full screen height, but their initial attempts have failed.

Current Issue:

  • The mobile banner is not extending to full viewport height as desired
  • Screenshots show the current state versus the intended full-screen goal

Proposed Solution:
GemPages support provided CSS customization steps:

  1. Navigate to Online Store → Theme → Edit code
  2. Open the theme.liquid file
  3. Insert custom CSS code before the closing </body> tag

Current Status:

  • The user attempted the suggested solution but reports it’s still not working correctly
  • Another community member requested the store URL for further troubleshooting
  • A Shopify preview link was shared for diagnostic purposes

The discussion remains unresolved as the proposed CSS fix did not achieve the desired full-screen mobile banner effect.

Summarized with AI on November 24. AI used: claude-sonnet-4-5-20250929.

Hello there,

I’m trying to change the height of my mobile version main banner to full screen height, but I failed.

This is recent condition

The Goal

I hope that someone can help me.

Thanks in advance.

1 Like

Hello @JosephineJoseph

You can follow these steps:

  1. Go to Online Store->Theme->Edit code

  1. Open your theme.liquid file, paste the below code before


Your banner show like this

I hope the above is useful to you.

Kind & Best regards,
GemPages Support Team

@JosephineJoseph

can you please share store url

@GemPages

I’m sorry, but it still look like this. Did I do something wrong?

@KetanKumar

https://843bbmty7t2xwr57-67885334816.shopifypreview.com

is this the link?