[Python] Fpdf header and background

I need to create a pdf with header, footer and background color. Tge following code is generating all 3, but it seems the footer is getting behind the pdf rect

from fpdf import FPDF

class PDF(FPDF):
def header(self):
self.set_font(family='Helvetica', size=8)
self.cell(0, 10, 'test_header', align='L')

def footer(self):
self.set_y(-15)
self.set_font(family='Helvetica', size=8)
self.cell(0, 10, 'test_footer', align='L')

pdf = PDF()
pdf.add_page()
pdf.set_font("Times", size=12)

# BG
pdf.set_fill_color(r=249, g=247, b=242)
pdf.rect(h=pdf.h, w=pdf.w, x=0, y=0, style="F")```

With the above only footer is visible but without it, both are visible.

How can I achieve the desired outcome?

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