CSS selector for disabled input type="submit"

This is in 2021. This is the css selector, which worked for me on Chrome and Edge (IE seems to be not supported any longer: https://blogs.windows.com/windowsexperience/2021/05/19/the-future-of-internet-explorer-on-windows-10-is-in-microsoft-edge/):

input[type=submit]:disabled {
    background-color: #4a4a4a;
}