*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
      body {
        font-family: Arial, sans-serif;
        background-image: url("../images/background.jpg");
        background-repeat: no-repeat;
        background-size: cover;
        background-position: center;
        backdrop-filter: blur(5px);
        background-color: rgba(255, 255, 255, 0.5);
      }
      header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background-color: #f5f5f5;
  }
  
  .logo img {
    width: 100px;
    height: auto;
  }
  
  nav ul {
    list-style: none;
    display: flex;
  }
  
  nav ul li {
    margin-left: 15px;
  }
  
  nav ul li a {
    text-decoration: none;
    color: #333;
  }
  
      /* navbar */
  
      .hero {
        width: 100%;
    text-align: center;
    padding: 40px;
    background-color: #f8f8f8;
  }
  
  .hero>h1 {
    font-size: 50px;
    margin-bottom: 10px;
    transition: all .5s ease;
    text-align: center;
    
  }
  .hero h1:hover{
    color:chocolate;
    text-shadow: 10px 10px 10px ;
  }
  
   h2 {
    font-size: 24px;
    color: #777;
    margin-bottom: 10px;
  }
      main {
        margin: 20px;
      }
      
      p {
        line-height: 1.5;
      }
      
      .section {
        background-color: #fff;
        padding: 20px;
        margin-bottom: 20px;
        border-radius: 5px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      }
      
      .quiz {
        background-color: #f9f9f9;
        padding: 10px;
        margin-top: 10px;
        border-radius: 5px;
      }
      
      .question {
        margin-bottom: 10px;
      }
      
      .option {
        margin-bottom: 5px;
      }
      
      .option input[type="radio"] {
        margin-right: 5px;
      }
      
      .video {
        display: flex;
        justify-content: center;
        align-items: center;
        height: 300px;
        background-color: #f9f9f9;
        margin-bottom: 20px;
      }