效果图

在这里插入图片描述

代码

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>扩展卡片</title>
  </head>
  <body>
    <div class="container">
      <div class="panel active" style="background-image: url(./img/img1.jpg)">
        <h3>海阔天空</h3>
      </div>
      <div class="panel" style="background-image: url(./img/img2.jpg)">
        <h3>蓝天白云</h3>
      </div>
      <div class="panel" style="background-image: url(./img/img3.jpg)">
        <h3>山川湖海</h3>
      </div>
      <div class="panel" style="background-image: url(./img/img4.jpg)">
        <h3>星空灿烂</h3>
      </div>
      <div class="panel" style="background-image: url(./img/img5.jpg)">
        <h3>绿树成荫</h3>
      </div>
    </div>

    <script>
      const panels = document.querySelectorAll(".panel");

      panels.forEach(panel => {
        panel.addEventListener("click", () => {
          removeActiveClasses();
          panel.classList.add("active");
        });
      });

      function removeActiveClasses() {
        panels.forEach(panel => {
          panel.classList.remove("active");
        });
      }
    </script>
  </body>
</html>

* {
  box-sizing: border-box;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}

.container {
  display: flex;
  width: 90vw;
}

.panel {
  background-size: auto 100%;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 50px;
  color: #fff;
  flex: 0.5;
  cursor: pointer;
  height: 80vh;
  position: relative;
  margin: 10px;
  transition: flex 0.7s cubic-bezier(0.05, 0.6, 0.4, 0.9);
}

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

.panel.active {
  flex: 5;
}

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

@media (max-width: 500px) {
  .container {
    width: 100vw;
  }
  .panel:nth-of-type(4) {
    display: none;
  }

  .panel:nth-of-type(5) {
    display: none;
  }
}