Kirchik
81 lines
2.2 KiB
HTML
81 lines
2.2 KiB
HTML
<div id="back-to-top" class="back-to-top-btn" onclick="scrollToTop()">
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↑
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</div>
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<style>
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.back-to-top-btn {
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position: fixed;
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bottom: 30px;
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right: 30px;
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background: rgba(24, 191, 239, 0.9);
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color: #ffffff;
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border: none;
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border-radius: 50%;
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width: 56px;
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height: 56px;
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cursor: pointer;
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font-size: 1.2rem;
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transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
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opacity: 0;
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visibility: hidden;
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z-index: 1000;
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display: flex;
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align-items: center;
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justify-content: center;
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box-shadow: 0 4px 12px rgba(24, 191, 239, 0.3), 0 2px 4px rgba(0, 0, 0, 0.1);
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backdrop-filter: blur(10px);
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}
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.back-to-top-btn.show {
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opacity: 1;
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visibility: visible;
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}
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.back-to-top-btn:hover {
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background: rgba(24, 191, 239, 1);
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transform: translateY(-2px) scale(1.05);
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box-shadow: 0 8px 20px rgba(24, 191, 239, 0.4), 0 4px 8px rgba(0, 0, 0, 0.2);
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}
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.back-to-top-btn:active {
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transform: translateY(0) scale(0.95);
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transition: all 0.1s ease;
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}
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@media (max-width: 768px) {
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.back-to-top-btn {
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bottom: 20px;
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right: 20px;
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width: 48px;
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height: 48px;
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font-size: 1.1rem;
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}
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}
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</style>
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<script>
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function scrollToTop() {
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window.scrollTo({
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top: 0,
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behavior: 'smooth'
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});
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}
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window.addEventListener('scroll', function() {
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const backToTopBtn = document.getElementById('back-to-top');
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// Вычисляем высоту страницы и положение скролла
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const documentHeight = document.documentElement.scrollHeight;
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const windowHeight = window.innerHeight;
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const scrollTop = window.pageYOffset || document.documentElement.scrollTop;
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// Показываем кнопку только в последней трети страницы
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const scrollPercent = (scrollTop + windowHeight) / documentHeight;
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if (scrollPercent > 0.66) { // Показываем когда прокрутили 66% страницы
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backToTopBtn.classList.add('show');
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} else {
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backToTopBtn.classList.remove('show');
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}
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});
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</script> |