Changing button colours

I would like all buttons to be red. e.g. the WP Search widget button, Submit button etc.

I have chosen the red theme and am having no luck entering the following in the Custom CSS field.

input[type=”submit”]
{
background-color: #363636;
}

(I changed the above colour to #FF0000)

But I cannot get the button to change to red.

All help will be appreciated.