h1 .anchor,h2 .anchor,h3 .anchor,h4 .anchor{display:inline-block;position:relative;width:0;margin:0;left:1em;color:#03a9f4;opacity:0;font-size:0.75em;text-decoration:none;transition:opacity 0.25s ease,color 0.25s ease}h1:hover .anchor,h1 .anchor:focus,h2:hover .anchor,h2 .anchor:focus,h3:hover .anchor,h3 .anchor:focus,h4:hover .anchor,h4 .anchor:focus{opacity:1}[data-glow="true"]{animation:highlight_glow 2s}@keyframes highlight_glow{0%{background:none}10%{background:#81d4fa}100%{background:none}}