def METHOD_NAME(assert_pixels):
    assert_pixels('''
        ___BBrrrr
        ___BBrrrr
        ___BBrrrr
        ___BBrrrr
        ___BBrrrr
    ''', '''<style>@page { size: 9px 5px; background: linear-gradient(
      to right, white 3px, blue 0, blue 5px, red 0
    )''')