body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 600px;
    margin: 100px auto;
    text-align: center;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
}

button:hover {
    background-color: #0056b3;
}

#profile {
    position: fixed;
    top: 10px;
    right: 10px;
    background-color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 9999;
}

#claimButton[disabled] {
    background-color: #537bc3;
    /* Màu nền xám */
    cursor: not-allowed;
    /* Con trỏ là not-allowed */
}

.presale {
    margin-top: 20px;
}

.presale input[type="number"] {
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 5px;
    width: 90px;
}

.presale input[type="text"] {
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 5px;
    width: 100px;
}

.presale button {
    background-color: #4caf50;
    margin-left: 15px;
}

.presale button:hover {
    background-color: #45a049;
}

.error-message {
    color: red;
    display: none;
}

.unit {
    margin-left: 5px;
    margin-right: 5px;
}