*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Rubik", sans-serif;
  font-optical-sizing: auto;
  font-weight: normal;
  font-style: normal;
}

/* main start */
  body {
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
    
   
}

  
  .change{
    width: 80%;
  }

  .main-change{
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .container {
    max-width: 800px;
    margin: 30px auto;
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
  }
  
  h1 {
    font-size: 24px;
    text-align: center;
    color: #333;
  }
  
  .tabs {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 20px;
    border-bottom: 2px solid #ddd;
  }
  
  .tab {
    padding: 10px 20px;
    border: none;
    background: #e9f6ff;
    color: #007bff;
    cursor: pointer;
    font-size: 16px;
    margin-right: 10px;
    border-radius: 4px 4px 0 0;
  }
  
  .tab.active {
    background: #007bff;
    color: #fff;
  }
  
  .tab:hover {
    background: #007bff;
    color: #fff;
  }
  
  .content h2 {
    font-size: 20px;
    margin-bottom: 10px;
  }
  
  .content h3 {
    font-size: 18px;
    margin-top: 20px;
    color: #555;
  }
  
  .content p {
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 26px;
  }

  .content h4 {
    font-size: 15px;
    margin-top: 20px;
    margin-bottom: 15px;
    color: #555;
  }