- index.html
- style.css
HTML
<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Transition duration, step 2</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="material.css">
    <link rel="stylesheet" href="style.css">
  </head>
  <body class="theory-theme">
    <button class="btn" type="button"></button>
  </body>
</html>
CSS
.btn {
  background-color: #ffffff;
  transition-duration: 1s;
}
.btn-active {
  background-color: #ff5252;
}
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Goalscompleted
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- Assign a text color of #ffffffand atransform: rotate(45deg)rotation for the active state of the.btn-activebutton,
- and then change the transition-durationfor the.btnbutton to200ms.
Click the .btn button in the mini-browser to switch its btn-active class and see a smooth transition.
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