Cell H3 contains the formula =$F$3 -G$5+E3 and this formula is copied to cell K6,
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< !DOCTYPE html > < html lang="en" > < head > < title > Page title < /title > < /head > < body > < div class="card" > < div class="heart" > < /div > < /div > < style > body{ margin:0; display:flex; align-items:center; justify-content: center; height: 300px; } .card{ width:0; height:0; border-top:100px solid #eee; border-bottom:100px solid #ccc; border-right:170px solid #ddd; border-left:170px solid #ccc; } .heart{ width:32px; height:32px; background-color:#ff4848; transform:translate(-50%,-50%) rotate(45deg); animation:heartbeat 1.4s linear infinite; } .heart:before{ content:''; position:absolute; top:0; left:0; width:100%; height:100%; background-color:#ff4848; transform:translateY(-50%); border-radius:50%; } .heart:after{ content:''; position:absolute; top:0; left:0; width:100%; height:100%; background-color:#ff4848; transform:translateX(-50%); border-radius:50%; } @keyframes heartbeat{ 0%{ transform:translate(-50%,-50%) rotate(45deg) scale(1); } 25%{ transform:translate(-50%,-50%) rotate(45deg) scale(1); } 30%{ transform:translate(-50%,-50%) rotate(45deg) scale(1.4); } 50%{ transform:translate(-50%,-50%) rotate(45deg) scale(1.2); } 70%{ transform:translate(-50%,-50%) rotate(45deg) scale(1.4); } 100%{ transform:translate(-50%,-50%) rotate(45deg) scale(1); } } < /style > < /body > < /html >