Funnel conversion rate

<div class="rate"><div class="rate-inputs"><label>VIEW <input id="rate-view" type="range" min="30" max="95" value="70"><b id="rate-view-value">70%</b></label><label>CART <input id="rate-cart" type="range" min="15" max="90" value="50"><b id="rate-cart-value">50%</b></label><label>BUY <input id="rate-buy" type="range" min="20" max="95" value="60"><b id="rate-buy-value">60%</b></label></div><div class="rate-result"><small>1,000 VISITS →</small><strong id="rate-result">210</strong><span>BUYERS</span></div></div>

.rate{width:min(90%,740px);display:grid;grid-template-columns:1.4fr 1fr;gap:clamp(13px,4vmin,36px);align-items:center;font:800 clamp(10px,max(2vmin,1vw),16px)/1 sans-serif}.rate-inputs{display:grid;gap:clamp(9px,3vmin,21px)}.rate label{display:grid;grid-template-columns:clamp(35px,7vw,52px) 1fr clamp(30px,7vw,50px);gap:6px;align-items:center}.rate input{min-width:0;width:100%;accent-color:var(--accent)}.rate b{text-align:right}.rate-result{display:grid;gap:clamp(4px,1.5vmin,10px);border:2px solid var(--fg);box-shadow:7px 7px 0 var(--accent-2);padding:clamp(9px,3vmin,24px);text-align:center}.rate-result small{color:var(--muted)}.rate-result strong{font:900 clamp(26px,9vmin,70px)/1 sans-serif;color:var(--accent)}.rate-result span{letter-spacing:.1em}small{font-size:max(.833em,10px,1vw)}

const ids=['view','cart','buy'],inputs=ids.map(k=>document.getElementById('rate-'+k));function update(){const values=inputs.map((el,i)=>{document.getElementById('rate-'+ids[i]+'-value').textContent=el.value+'%';return Number(el.value)/100});document.getElementById('rate-result').textContent=Math.round(1000*values.reduce((a,b)=>a*b,1))}inputs.forEach(el=>el.oninput=()=>{clearInterval(auto);update()});update();let tick=0;const auto=setInterval(()=>{inputs[1].value=tick++%2?50:65;update()},1800);