WordPress theme support page print

Add following snippet to style.css

@media print {
  .post-nav,.post-tags,.sidebar,.s1,.s2,.single article ~ *,li.comments, #header, #footer{display: none !important;}
  * {color:black !important;background: none !important;        }
  body {font-size: 10pt;}
  .main-inner{padding-left:0 !important;padding-right:0 !important;}
}

Hueman theme: Colored fonts printing, removed share icon bar

@media print {
  #header, #footer, .sharrre-container, .post-nav,.post-tags,.sidebar,.s1,.s2,.single article ~ *,li.comments {display: none !important;}
  * { !important;background: none !important;        }
  body {font-size: 10pt;}
  .main-inner{padding-left:0 !important;padding-right:0 !important;}
}

Used it on Hueman theme.

Got help from: https://wordpress.org/support/topic/website-is-not-printer-friendly