Firefox - Find Blog Elements CSS Code

Element CSS code found below:

.contact-form-button-submit {
    color: red;
    background: white;
    border-color: red;
}

from the code above, you can get the following ones:

/* Submit button style (on mouseover) */
.contact-form-button-submit:hover{
    color: white;
    background: red;
    border-color: white;
}

/* Submit button style (while sending message) */
.contact-form-button-submit.disabled{
    color: white;
    background: red;
    border-color: white;
}

then the codes can be applied in the blog Theme\Customize\Advanced\Add CSS