Umbrella Signal — Page Top

Source Code

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

<!-- TB-2081 / Back to Top: insert before closing body (inside footer for TB-2083) -->
<button class="tb-btt bt2081" type="button" data-backtop aria-label="ページの先頭へ戻る"><span class="umbrella-roof"></span><span class="umbrella-stem"></span><span class="umbrella-foot"></span><span class="umbrella-label">PAGE TOP</span><i class="raindrop one"></i><i class="raindrop two"></i></button>

/* TB-2081 : 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}
@keyframes rainFall{to{background-position:0 120px}}
.bt2081{position:fixed;right:18px;bottom:20px;width:110px;height:131px;color:#1f5771;background:none}
.umbrella-roof{position:absolute;left:12px;top:11px;width:85px;height:39px;border-radius:95px 95px 0 0;background:#f3bd66;border-bottom:5px solid #d68646;transition:transform .35s}
.umbrella-roof:after{content:"";position:absolute;inset:7px 7px 0;border-radius:80px 80px 0 0;border-top:2px solid #fff5db}
.umbrella-stem{position:absolute;top:49px;left:53px;width:3px;height:43px;background:#265c69}
.umbrella-foot{position:absolute;top:86px;left:53px;width:24px;height:17px;border:3px solid #265c69;border-top:0;border-radius:0 0 25px 25px}
.umbrella-label{position:absolute;left:8px;bottom:0;right:8px;background:#fffef4;border:1px solid #8db5bc;padding:7px 4px;font-size:11px;font-weight:850;letter-spacing:.1em;border-radius:999px}
.raindrop{position:absolute;top:53px;width:5px;height:9px;background:#6bb7cc;border-radius:80% 80% 50% 50%;animation:dropping 1.5s linear infinite}
.raindrop.one{left:24px}
.raindrop.two{right:26px;animation-delay:.6s}
@keyframes dropping{to{transform:translateY(21px);opacity:0}}
.bt2081:hover .umbrella-roof{transform:translateY(-7px) scaleX(1.1)}
.bt2081:hover .umbrella-label{background:#155b73;color:white}
@media (max-width:700px){.bt2081{right:8px;bottom:12px;transform:scale(.83);transform-origin:bottom right}}
@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

Outdoor goods, umbrellas and lifestyle brands.

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.