.reading-progressbar {
   position: fixed;
   z-index: 2;
   top: 0;
   left: 0;
   width: 100%;
   height: 5px;
   color: var(--color-primary);
   pointer-events: none;
   display: none;

 }

 .reading-progressbar--is-active {
   display: block;
 }

 .reading-progressbar::-webkit-progress-bar {
   background-color: transparent;
 }

 .reading-progressbar::-webkit-progress-value {
   background-color: currentColor;
 }

 .reading-progressbar::-moz-progress-bar {
   background-color: currentColor;
 }

 .reading-progressbar__fallback {
   position: absolute;
   left: 0;
   top: 0;
   height: 100%;
   background-color: currentColor;
 }

 .reading-content { // demo style
   padding: var(--space-md);
 }