Reading Folio — Back to Cover

Source Code

Copy the HTML, CSS or JavaScript you need for your project.

<!-- TB-2075 / Back to Top: insert before closing body (inside footer for TB-2083) -->
<button class="tb-btt bt2075" type="button" data-backtop aria-label="この読みものの最初のページへ戻る"><span class="folio-number">01</span><span class="folio-divider"></span><span class="folio-label">表紙へ</span></button>

/* TB-2075 : paste only this CSS into the target page. */
.tb-btt{border:0;cursor:pointer;z-index:30;-webkit-tap-highlight-color:transparent;touch-action:manipulation;transition:transform .35s,opacity .3s,background .3s,color .3s,box-shadow .3s;pointer-events:none;opacity:0;visibility:hidden}.tb-btt.is-visible{pointer-events:auto;opacity:1;visibility:visible}.tb-btt:focus-visible{outline:3px solid #f9af4b;outline-offset:5px}.only-at-end{opacity:1;visibility:visible;pointer-events:auto}
.bt2075{position:fixed;right:0;bottom:9vh;width:78px;padding:18px 8px 20px;background:#2e3b32;color:#fff;box-shadow:-12px 10px 25px #16261b22;border:1px solid #607266;display:flex;flex-direction:column;align-items:center;gap:10px}
.folio-number{font:normal 36px Georgia,serif}
.folio-divider{width:36px;height:1px;background:#afc0ad}
.folio-label{font-size:12px;letter-spacing:.14em;writing-mode:vertical-rl}
.bt2075:hover{background:#58715e;transform:translateX(-8px)}
@media (max-width:700px){.bt2075{width:57px;padding:9px 4px 13px}.folio-number{font-size:27px}.folio-label{font-size:11px}}
@media(prefers-reduced-motion:reduce){.tb-btt,.tb-btt *{animation-duration:.01ms!important;transition-duration:.01ms!important}}

(()=>{'use strict';const control=document.querySelector('[data-backtop]');if(!control)return;const reduced=matchMedia('(prefers-reduced-motion: reduce)');const footer=control.classList.contains('only-at-end');let busy=false;function refresh(){busy=false;const max=Math.max(1,document.documentElement.scrollHeight-window.innerHeight);const p=Math.min(1,scrollY/max);document.documentElement.style.setProperty('--page-progress',p.toFixed(4));if(!footer){const show=scrollY>145;control.classList.toggle('is-visible',show);control.tabIndex=show?0:-1;control.setAttribute('aria-hidden',String(!show));}const number=document.querySelector('[data-progress-number]');if(number)number.textContent=Math.round(p*100)+'%';}function onscroll(){if(!busy){busy=true;requestAnimationFrame(refresh)}}addEventListener('scroll',onscroll,{passive:true});addEventListener('resize',onscroll,{passive:true});control.addEventListener('click',()=>window.scrollTo({top:0,behavior:reduced.matches?'instant':'smooth'}));refresh();})();

How to Use

Insert the HTML button near the end of body, load the CSS, and include JavaScript using defer. Test scrolling, returning to the top, and positioning on mobile.

Use Case

Literary journals, publishing and editorial sites.

Technical Notes

Keep controls usable on touch devices. Test keyboard focus and reduced-motion preferences.

Mobile：Check tap target, visibility and positioning on small screens.

Browser：Designed for current Chrome, Edge, Firefox and Safari.

Reduced Motion：CSS animations respect the reduced-motion preference.