body {
    margin: 0;
    background-color: #fff;
  }
  
  * {box-sizing:border-box}

  .menu {
    display: flex;
    top: 0;
    position: sticky;
    flex-direction: row;
    background-color: #95bcf7;
    justify-content: space-evenly;
    padding: 10px;
    z-index: 1;
  }
  
  .menu a {
    cursor: pointer;
    width: 180px;
    text-decoration: none;
    color: black;
    border-radius: 0.7vw;
    text-align: center;
    line-height: 3vw;
    font-size: 1.2vw;
    font-family: "Noto Sans TC";
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.15vw;
    border: none;
  }
  
  .menu a:hover {
    background-color: #bed5f8;
    animation: fade 0.3s;
  }
  
  @keyframes fade {
    0% {
      opacity: 0.5;
    }
    100% {
      opacity: 1;
    }
  }
  
  #topblock {
    width: 100%;
    height: 15vw;
    background-color: #507ab9;
    color: rgb(247, 246, 246);
    font-family: "Noto Sans TC";
    font-size: 4vw;
    font-weight: 600;
    position: relative;
    text-align: center;
  
    display: flex;
    justify-content: center; 
    align-items: center; 
  }

  #info {
    font-family: "Inter";
    margin-top: 2vw;
    text-align: center;
    font-weight: 600;
    font-size: 1.2vw;
  }

  .thank-you-message {
    color: green;
    font-family: "Inter";
    font-size: 1vw;
    margin-top: 2vw;
    margin-left: 10vw;
    margin-right: 10vw;
    padding: 1.2vw;
    border: 0.05vw solid green;
    background-color: #e6ffe6;
    border-radius: 0.5vw;
    opacity: 1; /* Fully visible */
    transition: opacity 2s ease-in-out; /* 2-second fade-out effect */
    display: none; /* Initially hidden */
  }

  .thank-you-message.show {
    display: block; /* Show the message */
  }

  /* Style your form as needed */
  form {
      margin-top: 2vw;
      margin-left: 10vw;
      margin-right: 10vw;

  }

  input, textarea {
      font-size: 1vw;
      font-family: "Inter";
      display: block;
      width: 100%;
      margin-bottom: 10px;
      padding: 10px;
  }

  button {
    font-size: 1vw;
    font-family: "Inter";
    display: block;
    width: 100%;
    margin-bottom: 10px;
    padding: 10px;
    border: none;
    background-color: #95bcf7;
    border-radius: 0.3vw;
    cursor: pointer;
  }