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