02-扩展卡片 Expanding Cards

html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css" />
    <title>Expanding Cards</title>
</head>
<body>
    <div class="container">
        <div class="panel active" style="background-image: url('https://images.unsplash.com/photo-1558979158-65a1eaa08691?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80')">
          <h3>Explore The World</h3>
        </div>
        <div class="panel" style="background-image: url('https://images.unsplash.com/photo-1572276596237-5db2c3e16c5d?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80')">
          <h3>Wild Forest</h3>
        </div>
        <div class="panel" style="background-image: url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1353&q=80')">
          <h3>Sunny Beach</h3>
        </div>
        <div class="panel" style="background-image: url('https://images.unsplash.com/photo-1551009175-8a68da93d5f9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1351&q=80')">
          <h3>City on Winter</h3>
        </div>
        <div class="panel" style="background-image: url('https://images.unsplash.com/photo-1549880338-65ddcdfd017b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80')">
          <h3>Mountains - Clouds</h3>
        </div>
    </div>
    <script src="./script.js"></script>
</body>
</html>

css

@import url('https://fonts.googleapis.com/css?family=Muli&display=swap');

*{
    box-sizing: border-box;
}

body{
    font-family: 'Muli',sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
}

.container{
    display: flex;
    width: 90vw;
}
.panel{
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 80vh;
    border-radius: 50px;
    color: #fff;
    cursor: pointer;
    flex: 0.5;
    margin: 10px;
    position: relative;
    -webkit-transition: all 700ms ease-in;
}

.panel h3{
    font-size: 24px;
    position: absolute;
    bottom: 20px;
    left: 20px;
    margin: 0;
    opacity: 0;
}

.panel.active{
    flex: 5;
}
.panel.active h3{
    opacity: 1;
    transition: opacity 0.3s ease-in 0.4s;
}

@media (max-width:480px) {
    .container{
        width: 100vw;
    }
    .panel:nth-of-type(4),
  .panel:nth-of-type(5) {
    display: none;
  }
}

JavaScript

const panels =document.querySelectorAll('.panel')

panels.forEach(panel=>{
    panel.addEventListener('click',()=>{
        removeAcriveClasses()
        panel.classList.add('active')
    })
})

function removeAcriveClasses(){
    panels.forEach(panel=>{
        panel.classList.remove('active')
    })
}