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8 December 2025

CSS-animierter Hintergrund und Ladeeffekte

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Andev Web</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>

<div class="carousel">
        <div class="list">
            <div class="item active" style="--background: #EA3D41">
                <div class="content">Strawberry</div>
                <img src="https://i.postimg.cc/W4mDGgk2/fruit-strawberry.png" class="fruit">
            </div>
            <div class="item" style="--background: #2D5643">
                <div class="content">avocado</div>
                <img src="https://i.postimg.cc/hjpfwns6/fruit-avocado.png" class="fruit">
            </div>
            <div class="item hidden" style="--background: #E7A043">
                <div class="content">orange</div>
                <img src="https://i.postimg.cc/KzZ1JjPt/fruit-orange.png" class="fruit">
            </div>
        </div>
        <div class="leaves"></div>
        <div class="mockup"></div>
        <div class="shadow"></div>
        <div class="arrow">
            <button id="prev"><</button>
            <button id="next">></button>
        </div>
    </div>
    <script src="app.js"></script>
</body>
</html>

CSS

html, body {
    height: 100%;
    overflow-x: hidden; /* Evita el desbordamiento horizontal */
}

body {
    margin: 0;
    padding: 0;
}
header{
    display: flex;
    height: 40px;
    justify-content: space-between;
    align-items: center;
    padding: 0 50px;
    box-sizing: border-box;
    font-family: monospace;
    font-weight: bold;
    font-size: large;
    position: relative;
    z-index: 1;
}
header ul{
    padding: 0;
    margin: 0;
    list-style: none;
    display: flex;
    gap: 20px;
}
.carousel{
    width: 100vw;
    height: 100vh;
    position: relative;
    overflow: hidden;
    margin-top: -40px;
}
.list{
    width: 100%;
    height: 100%;
}

.item{
    width: 100%;
    height: 100%;
    background-color: var(--background);
    position: absolute;
    top: 0;
    left: 0;
    overflow: hidden;
    display: none;
}
.item img.fruit{
    width: 90%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 15;
    pointer-events: none;
}
.item .content{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    font-size: 10rem;
    color: #eee;
    font-weight: bold;
    font-family: system-ui;
    text-transform: uppercase;
    white-space: nowrap;
}
.item.active{
    display: block;
}
.item.hidden{
    display: block;
    pointer-events: none;
    background-color: transparent;
    z-index: 1;
}

#prev,
#next{
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: transparent;
    border: 1px solid #eee9;
    background-color: #eee5;
    color: #eee;
    font-size: x-large;
    font-family: monospace;
    cursor: pointer;
    z-index: 15;
}
#prev{
    left: 20px;
}
#next{
    right: 20px;
}

@keyframes toActive{
    from{
        top: 100%;
        opacity: 0;
    }
}
@keyframes toOut{
    from{
        top: 50%;
        opacity: 1;
    }
}
.item.active img.fruit{
    animation: toActive 0.5s ease-in-out 1;
}
.item.hidden img.fruit{
    animation: toOut 0.8s ease-in-out 1;
    top: -100%;
    opacity: 0;
}
.item.active .content{
    animation: toActive 0.8s ease-in-out 1;
}
.item.hidden .content{
    opacity: 0;
}

.carousel.right .item.active img.fruit{
    animation: toActivePrev 0.5s ease-in-out 1;
}
.carousel.right .item.hidden img.fruit{
    animation: toOut 0.8s ease-in-out 1;
    top: 100%;
    opacity: 0;
}
.carousel.right .item.active .content{
    animation: toActivePrev 0.8s ease-in-out 1;
}

@keyframes toActivePrev{
    from{
        top: 0;
        opacity: 0;
    }
}

:root{
    --width-mockup: calc(371px / 1.5);
    --height-mockup: calc(673px / 1.5);
}

.mockup {
    position: absolute;
    top: 50%;
    left: 50%;
    --left: 0%;
    transform: translate(-50%, -50%);
    height: var(--height-mockup);
    width: var(--width-mockup);
    background: 
        url(https://i.postimg.cc/CMrRsFzf/mockup.png)  0 0 no-repeat, 
        url(https://i.postimg.cc/3NqW8ZPZ/list-Soda1.jpg) var(--left) 0;
    background-size: auto 100%;
    background-blend-mode: multiply;
    -webkit-mask-image: 
    url(https://i.postimg.cc/CMrRsFzf/mockup.png);
    -webkit-mask-repeat: no-repeat;
    -webkit-mask-size: auto 100%;
    transition: background 0.5s;
}

.leaves{
    position: absolute;
    width: 170px;
    height: 170px;
    background-image: url(https://i.postimg.cc/1z1nVJ4C/leaves.png);
    background-size: 100%;
    top: calc((50% - (var(--height-mockup) / 1.7)));
    left: calc((50% + (var(--width-mockup) / 5)));
}
.shadow{
    width: var(--width-mockup);
    height: 100px;
    background-color: #0008;
    border-radius: 50%;
    position: absolute;
    top:  calc((50% + (var(--height-mockup) / 2)));
    left: 50%;
    transform: translateX(-50%);
    filter: blur(20px);
}
@media screen and (max-width: 768px) {
    .item .content{
        transform: translate(-50%, -50%) scale(.5);
    }
    .item img.fruit{
        width: 100%;
        height: 100%;
        object-fit: cover;
    }
}

JS

let list = document.querySelectorAll('.carousel .list .item');
let carousel = document.querySelector('.carousel');
let next = document.getElementById('next');
let prev = document.getElementById('prev');

let mockup = document.querySelector('.mockup');

let count = list.length;
let active = 0;
let leftMockup = 0;
let left_each_item = 100 / (list.length - 1);

next.onclick = () => {
    active = active >= count - 1 ? 0 : active + 1;
    leftMockup = leftMockup + left_each_item;
    carousel.classList.remove('right');
    changeCarousel();
}
prev.onclick = () => {
    active = active <= 0 ? count - 1 : active - 1;
    leftMockup = leftMockup - left_each_item;
    carousel.classList.add('right');
    changeCarousel();
}
function changeCarousel() {
    // find item has class hidden to remove it
    let hidden_old = document.querySelector('.item.hidden');
    if(hidden_old) hidden_old.classList.remove('hidden');

// find item old active to remove it and add class hidden
    let active_old = document.querySelector('.item.active');
    active_old.classList.remove('active');
    active_old.classList.add('hidden');
    // add class active in position active new
    list[active].classList.add('active');
    // change mockup background
    mockup.style.setProperty('--left', leftMockup + '%');

clearInterval(refreshInterval);
    refreshInterval = setInterval(()=> {next.click()}, 3000);
}

// auto run 3s
let refreshInterval = setInterval(()=> {next.click()}, 3000);/

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