Price–pack architecture

<div class="packs"><div class="packgrid"><div><i style="height:45%"></i><b>SMALL</b><span>250 g</span><strong>$4</strong><small>$1.60 /100 g</small></div><div class="focus"><i id="midbar" style="height:68%"></i><b>MEDIUM</b><span id="grams">500 g</span><strong>$7</strong><small id="unit">$1.40 /100 g</small></div><div><i style="height:92%"></i><b>LARGE</b><span>800 g</span><strong>$10</strong><small>$1.25 /100 g</small></div></div><label>MEDIUM PACK SIZE <input id="size" type="range" min="350" max="650" step="50" value="500"></label></div>

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const r=document.querySelector('#size');function draw(){const g=+r.value;document.querySelector('#grams').textContent=g+' g';document.querySelector('#unit').textContent='$'+(700/g).toFixed(2)+' /100 g';document.querySelector('#midbar').style.height=(35+g/800*55)+'%'}r.oninput=draw;setTimeout(()=>{r.value=350;draw()},650);setTimeout(()=>{r.value=500;draw()},2600);