body {
    font-family: Arial, sans-serif;
    text-align: center;
    font-size: 25px;
    padding: 0px;
    /* Path to your image */
    background-image: url('BG_Submerged05.png');
    /* Ensures it covers the whole screen */
    /*background-size: cover;*/
    /* Centers the image */
    background-position: center;
    /* Prevents repeating */
    background-repeat: no-repeat;
    background-color: rgba(0,0,0,0.25);
  }

  .code-input {
    margin: 10px;
    padding: 10px;
    font-size: 16px;
    width: 150px;
    transition: transform 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
  }

  .code-input.correct {
    background-color: #e7f9e7;
    border-color: #4caf50;
    transform: scale(1.05);
  }

  .code-input.error {
    border-color: red;
    transform: translateX(-3px);
    animation: shake 0.4s cubic-bezier(0.25, 1.5, 0.5, 1);

  }

  .submit-button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }

  .submit-button:hover {
    background-color: #4caf50;
    color: white;
  }

  .error {
    color: red;
    margin-top: 10px;
    transition: opacity 0.3s ease-in-out;
  }

  .header {
    margin-bottom: 30px;
  }

  .intro {
    margin-bottom: 40px;
    font-size: 18px;
    line-height: 1.6;
  }

  .download-link {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0px 0;
    font-size: 48px;
  }

  .progress-bar-container {
    margin-top: 20px;
    width: 100%;
    max-width: 400px;
    background-color: #f0f0f0;
    border-radius: 5px;
    overflow: hidden;
    margin-left: auto;
    margin-right: auto;
  }

  .progress-bar {
    height: 20px;
    width: 0%;
    background: linear-gradient(90deg, red, orange, yellow, green, blue, indigo, violet);
    background-size: 200%;
    animation: moveGradient 3s linear infinite;
    transition: width 0.8s cubic-bezier(0.25, 1.5, 0.5, 1);
  }

  .popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    color: #4caf50;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    border: 3px solid transparent;
    background-clip: padding-box;
    animation: popup-fade 0.5s ease-out, pulse-border 1.5s infinite;
  }

  .popup span {
    font-size: 40px;
    display: block;
    margin-bottom: 15px;
  }

  .gallery {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
  }

  .gallery img {
    max-width: 200px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .gallery img:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  }

  @keyframes shake {

    0%,
    100% {
      transform: translateX(0);
    }

    25% {
      transform: translateX(-3px);
    }

    50% {
      transform: translateX(3px);
    }

    75% {
      transform: translateX(-3px);
    }
  }

  @keyframes moveGradient {

    0% {
      background-position: 0% 50%;
    }

    100% {
      background-position: 100% 50%;
    }
  }

  @keyframes popup-fade {
    from {
      transform: translate(-50%, -60%);
      opacity: 0;
    }

    to {
      transform: translate(-50%, -50%);
      opacity: 1;
    }
  }

  li {
    font:
      1rem 'Fira Sans',
      sans-serif;
      margin-bottom: 0.5rem;
  }

  .center {
    text-align: left;
    list-style-position: left;
    position: relative;
    left: 30%;
  }

  h1 {
    color: red;
  }