Side menu got Transparent when i scorll out side with a button

[brightroots11]

I have read the guidelines for contributing and I understand

• My issue is happening in the latest version of SideMenu (older versions are no longer maintained).
• My issue was not solved in the README.
• My issue can not be answered on stackoverflow.com.
• My issue is not a request for new functionality that I am unwilling to build and contribute with a pull request.
• My issue is reproducible in the demo project.

Describe the bug
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To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots

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Additional context
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[brightroots11]

it should be full but it is half and half is transparent ? can't find any solution of it.