The Little Box — Back to Page One

Source Code

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

<!-- TB-2080 / Back to Top: insert before closing body (inside footer for TB-2083) -->
<button class="tb-btt bt2080" data-backtop type="button" aria-label="ページの先頭、チョコレートの紹介へ戻る"><span class="mini-flap"></span><span class="box-brand">CACAO<br>LETTER</span><span class="box-return">BACK TO<br>PAGE ONE</span></button>

/* TB-2080 : 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}
.bt2080{position:fixed;right:20px;bottom:22px;width:111px;height:104px;background:#a3495c;border:4px double #e8b4a3;color:#fff5e8;box-shadow:0 11px 25px #4f2b3155;transform:rotate(5deg);display:flex;flex-direction:column;align-items:center;justify-content:space-evenly}
.mini-flap{position:absolute;top:-12px;left:0;width:100%;height:20px;background:#d68e95;clip-path:polygon(0 100%,50% 0,100% 100%);transition:transform .4s;transform-origin:bottom}
.box-brand{font:bold 14px/1.05 Georgia,serif;letter-spacing:.03em}
.box-return{font:800 8px/1.3 Arial;letter-spacing:.1em}
.bt2080:hover{background:#b76a7d;transform:translateY(-8px) rotate(0)}
.bt2080:hover .mini-flap{transform:rotateX(75deg)}
@media (max-width:700px){.bt2080{width:86px;height:88px;right:12px;bottom:12px}.box-brand{font-size:12px}.box-return{font-size:7px}}
@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

Food products, confectionery and retail.

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.