What is the output of
wkhtmltopdf --margin-top 15mm --margin-right 15mm --page-size A4 --encoding UTF-8 --background --print-media-type --images --margin-left 15mm --no-outline --margin-bottom 15mm https://en.wikipedia.org /tmp/f73bb79af6ca7dcd93919a11de5303be588ee061ec9d56bc5c0d22fd.pdf
?