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Viewing _pm-sticky-header.scss 
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/*
 * sticky header and container for sections
 */

$sticky-title-height: 10rem !default;
.sticky-title {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  box-shadow: 0 5px 5px 0 rgba(0, 0, 0, 0.1);
  padding: .5em .75em;
  background: inherit;
  z-index: 11;
}
.sticky-title--onTop {
  box-shadow: none;
}
.sticky-title--noPadding {
  padding: 0;
}

.container-section-sticky {
  padding: 3em 2em 0 2em;
  max-width: 120ch; // avoid too long lines
  margin-left: auto;
  margin-right: auto;
}

.container-section-sticky.pt0 { // 😓
  padding-top: 0;
}

.container-section-sticky--fullwidth {
  max-width: none;
}

.container-section-sticky-section {
  margin-bottom: 8rem;
}


/* trick for fixing anchor links */
.header-height-anchor {
  position: absolute;
  top: -#{$sticky-title-height};
}

// not sticky on mobile
@include respond-to($breakpoint-small) {
  .sticky-title:not(.onmobile-remain-sticky) {
    position: static;
    box-shadow: none;
  }
  .container-section-sticky-section {
    margin-bottom: 8rem;
  }
  .header-height-anchor {
    position: static;
    top: 0;
  }
}