Clay Spiral — Return to Start

Source Code

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

<!-- TB-2079 / Back to Top: insert before closing body (inside footer for TB-2083) -->
<button class="tb-btt bt2079" type="button" data-backtop aria-label="作品のはじまり、ページ先頭へ戻る"><span class="clay-wheel"><i></i></span><span class="clay-label">ページの最初へ</span></button>

/* TB-2079 : 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}
.bt2079{position:fixed;right:22px;bottom:22px;display:flex;align-items:center;gap:10px;padding:10px 14px 10px 9px;background:#f7f2e8;color:#5c493d;border:1px solid #bca78e;border-radius:999px;box-shadow:0 10px 22px #48362933}
.clay-wheel{width:53px;height:53px;border:3px solid #907b61;border-radius:50%;display:grid;place-items:center;background:repeating-radial-gradient(circle,#f7f2e8 0 5px,#d7c6ae 6px 7px);animation:pottery 8s linear infinite}
.clay-wheel i{width:13px;height:13px;background:#9d6652;border-radius:50%}
.clay-label{font:normal 13px "Yu Mincho",serif;white-space:nowrap}
@keyframes pottery{to{transform:rotate(360deg)}}
.bt2079:hover{background:#e9d7c4;transform:translateY(-4px)}
@media (max-width:700px){.bt2079{right:10px;bottom:13px}.clay-wheel{height:45px;width:45px}}
@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

Pottery studios, ceramics, handmade craft.

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.