Change button hover style

Site URL: https://tangerine-smilodon-wpdh.squarespace.com/

I'm trying to change the button hover style on my website. Ive tried loads of different codes for it and they all seem not to be working. Im thinking its because there already is a default hover style which is overriding my code?

Any suggestions?

My website is currently set on private. here's the URL and password: https://tangerine-smilodon-wpdh.squarespace.com/ and the password is abc123

You mean Form button? Add this to Design > Custom CSS

input.button.sqs-system-button.sqs-editable-button.sqs-button-element--primary:hover {
    background-color: red;
    color: white;
}