body {
    font-family: 'Roboto', sans-serif;
    background-color: #212121; /* dark gray background */
    color: #33cc33; /* green text color */
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden; /* hide scrollbar */
  }
  
  .container {
    background: #333; /* dark gray background */
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    padding: 30px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    border: 1px solid #444; /* dark gray border */
  }
  
  h1 {
    margin-bottom: 25px;
    font-size: 24px;
    color: #ff69b4; /* pink text color */
    text-shadow: 0 0 10px #ff69b4; /* pink text shadow */
  }
  
  .form-group {
    margin-bottom: 20px;
    text-align: left;
  }
  
  label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #66d9ef; /* blue-green text color */
  }
  
  select {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    margin-bottom: 20px;
    border: 1px solid #444; /* dark gray border */
    border-radius: 8px;
    background: #333; /* dark gray background */
    transition: border-color 0.3s;
    color: #66d9ef; /* blue-green text color */
  }
  
  select:focus {
    border-color: #ff69b4; /* pink border color */
  }
  
  button {
    background-color: #33cc33; /* green background color */
    color: #212121; /* dark gray text color */
    border: none;
    padding: 12px 20px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 20px;
  }
  
  button:hover {
    background-color: #1abc9c; /* darker green background color */
  }
  
  .hidden {
    display: none;
  }
  
  .progress-bar {
    background-color: #333; /* dark gray background */
    border-radius: 8px;
    overflow: hidden;
    margin-top: 25px;
    height: 35px;
    position: relative;
    border: 1px solid #444; /* dark gray border */
  }
  
  .progress-bar div {
    height: 100%;
    background-color: #ff69b4; /* pink background color */
    width: 0;
    transition: width 0.5s;
  }
  
  #progressText {
    margin-top: 15px;
    font-weight: 600;
    color: #66d9ef; /* blue-green text color */
  }
  
  .key-item {
    display: flex;
    align-items: center;
    margin-top: 15px;
  }
  
  .key-item input {
    flex: 1;
    padding: 12px;
    font-size: 16px;
    border: 1px solid #444; /* dark gray border */
    border-radius: 8px;
    margin-right: 12px;
    background: #333; /* dark gray background */
    color: #66d9ef; /* blue-green text color */
  }
  
  .copyKeyBtn {
    background-color: #9b59b6; /* deep pink background color */
    border: none;
    padding: 12px 20px;
    color: #212121; /* dark gray text color */
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  .copyKeyBtn:hover {
    background-color: #8e44ad; /* deep purple background color */
  }
  
  .footer {
    margin-top: 25px;
    font-size: 14px;
    color: #777;
  }
  
  #copyStatus {
    margin-top: 15px;
    color: #33cc33; /* green text color */
  }