[Resolved] slideout-overlay became full screen after import site digital creative

Hello, I have imported digital creative from the site library.

The off canvas slide out became full screen. I found this style was added:

@media (max-width: 768px)
.slideout-overlay {
    top: -100px;
    height: calc(100% + 100px);
    height: calc(100vh + 100px);
    min-height: calc(100% + 100px);
}

I want to remove it. However I cannot find it in the additional css section.

Can you tell me where to find it?

Thank you very much for your help.