Exemple HTML de bascule CSS

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <label class="switch">
        <input type="checkbox" />
        <span class="slider"></span>
        <img
          class="off"
          src="data:image/jpeg;base64,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"
        />
        <img
          class="on"
          src="data:image/jpeg;base64,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"
        />
      </label>
</body>
</html>

CSS

body {
    background-color: #212121;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.switch {
  font-size: 30px;
  position: relative;
  display: inline-block;
  width: 4em;
  height: 0.3em;
}

/* Hide default HTML checkbox */
.switch input {
  opacity: 1;
  width: 0;
  height: 0;
}

/* The slider */
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #900c3f;
  transition: 0.4s;
}

.off {
  position: absolute;
  content: "";
  height: 2em;
  width: 2em;
  background-color: white;
  transition: 0.4s;
  image-rendering: pixelated;
  opacity: 1;
  left: 0;
  bottom: -0.8em;
}

.on {
  position: absolute;
  content: "";
  height: 2em;
  width: 2em;
  background-color: white;
  transition: 0.4s;
  image-rendering: pixelated;
  opacity: 0;
  left: 0;
  bottom: -0.8em;
}

.switch input:checked + .slider {
  background-color: #c70039;
}

.switch input:focus + .slider {
  box-shadow: 0 0 1px #c70039;
}

.switch input:checked ~ .off {
  transform: translateX(2em);
}

.switch input:checked ~ .on {
  transform: translateX(2em);
  opacity: 1;
  box-shadow: 0 0 10px 5px rgba(185, 178, 42, 0.919), 0 0 20px 10px rgba(199, 186, 0, 0.3), 0 0 30px 15px rgba(199, 0, 57, 0.1);
}