Capybara - how to check for text on submit button?

I have a submit button with text and I want to check for both.

i.e. the actual page has:

<input class="button" type="submit" value="Continue" tabindex="3"
name="nav[save]"></input>`

So I've tried

  it "I can see the Continue button" do
    expect(page.find('input[type="submit"]').find('input[value="Continue"]')).to be
  end

but I get

Unable to find css "input[value=\"Continue\"]"

and

expect(page.find('input[type="submit"]')).
  to have_selector('input[value="Continue"]')

but I get

expected to find css "input[value=\"Continue\"]" but there were no matches