html,
body {
  position: relative;
  padding: 0;
  margin: 0;
}

* {
  background-color: transparent !important;
  color-adjust: exact !important;
}

header,
footer,
.sidebar,
.wp-block-comments,
.single-post-meta,
.quiz-timer,
.submit-container,
#wpadminbar,
.adsbygoogle {
  display: none !important;
}

body .single-content {
  height: auto !important;
  position: relative;
  height: 100%;
}
body {
}
.single-content {
  background-image: url(https://mektebli.net/wp-content/themes/mektebli-theme-v5/assets/images/watermark.png) !important;
  background-position: center top;
  background-repeat: repeat-y;
  position: relative;
  height: 100%;
}
.single-content:after {
  content: '';
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}