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 ul { display: flex; padding: 0; margin: 0; list-style-type: none; } ul:hover li:not(:hover) a { opacity: 0.2; } ul li { position: relative; padding: 30px 25px 30px 25px; cursor: pointer; } ul li::after { position: absolute; content: ""; top: 100%; left: 0; width: 100%; height: 2px; background: #3498db; transform: scaleX(0); transition: 0.4s cubic-bezier(0.165, 0.84, 0.44, 1); } ul li:hover::after, ul li.active::after { transform: scaleX(1); }

 document.querySelectorAll('a').forEach(elem => { elem.onmouseenter = elem.onmouseleave = e => { const tolerance = 5; const left = 0; const right = elem.clientWidth; let x = e.pageX - elem.offsetLeft; if (x - tolerance < left) x = left; if (x + tolerance > right) x = right; elem.style.setProperty('--x', `${x}px`); }; });

 a { position: relative; font-weight: 600; text-decoration: none; color: rgba(0, 0, 0, 0.4); transition: color .3s ease; } a::after { --scale: 0; content: ''; position: absolute; left: 0; right: 0; top: 100%; height: 3px; background: #4c81c9; -webkit-transform: scaleX(var(--scale)); transform: scaleX(var(--scale)); -webkit-transform-origin: var(--x) 50%; transform-origin: var(--x) 50%; transition: -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1); transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1); transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1), -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1); } a:hover { color: #4c81c9; } a:hover::after { --scale: 1; }