Unable to change form button colour

I am having issues changing the button background colour on the form at the top of this page.

https://wrpartners.co.uk/ppc-services-landing-page-template

I have added this custom CSS;

.sqs-background-enabled.sqs-block-form .sqs-editable-button.sqs-button-element--primary, .site-wrapper .sqs-background-enabled.sqs-block-form .sqs-editable-button {
    background: #41986c; important!;
  }

However, I think the below CSS is stopping it from working.

.sqs-button-element--primary {
    background-color: #000000;
    color: white; important!;
}

When I view and test in Chrome developer tools and remove the important!; from the above code it does work. However I don't have access to the CSS files to remove that. Is there any way I can achieve the colour change for the form button withinin custom css?

@WR-Mike Your code has some syntax errors. You can try this code snippet:

input[type='submit'] {
	background: #41986c !important;
}

@WR-Mike Add the code under Custom CSS panel. Thanks!

Thank you Lesum. Unfortunately this did not seem to work.

@WR-Mike It should have worked. I tested it. I don't see the code added to your site. Did you add the code under Custom CSS panel?

@Lesum I add it to the page header code injection. I have just readded it again and saved. Should I have put it somewhere else? 

@WR-Mike That's why it didn't work. You should add it under Website > Utilities > Website Tools > Custom CSS.

Thanks @Lesum will this change the background button colour just for this page? As I don't want to change it elsewhere.

Amazing @Lesum thanks so much 🙏