#progress { position: fixed; bottom: 90px; right: 17px; height: 60px; width: 60px; display: none; place-items: center; border-radius: 50%; box-shadow: 0 0 10px rgba(0, 0, 0, 0.2); cursor: pointer; z-index: 999; } #progress-value { display: block; height: calc(100% - 15px); width: calc(100% - 15px); background-color: #ffffff; border-radius: 50%; display: grid; place-items: center; font-size: 35px; color: #004796; } let calcScrollValue = () => { let scrollProgress = document.getElementById("progress"); let progressValue = document.getElementById("progress-value"); let pos = document.documentElement.scrollTop; let calcHeight = document.documentElement.scrollHeight - document.documentElement.clientHeight; let scrollValue = Math.round((pos * 100) / calcHeight); if (pos > 100) { scrollProgress.style.display = "grid"; } else { scrollProgress.style.display = "none"; } scrollProgress.addEventListener("click", () => { document.documentElement.scrollTo({top: 0, behavior: 'smooth'}); }); scrollProgress.style.background = `conic-gradient(#004796 ${scrollValue}%, #d7d7d7 ${scrollValue}%)`; }; window.onscroll = calcScrollValue; window.onload = calcScrollValue;