Reduce form block button in Brine SS7.0

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Hello Squarespace experts!

I am once again in need of assistance with some code as I am trying to increase the size of the form button. The section is on the lower part of the page.

These are my codes, but I can't seem to make them work:

#block-7e4a384bb11453f45f5e { button.lightbox-handle .sqs-system-button .sqs-editable-button .sqs-button-element--primary {
    width: 50%;
    font-size: 20px;
}
}

I also tried this

#block-7e4a384bb11453f45f5e { body:not(.button-style-default).button-corner-style-pill .sqs-editable-button {
    width: 50%;
    font-size: 20px;
} }

Both doesn't seem to work. 😞

Thank you kindly in advance! 🙂