body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f4f9;
}

#app {
    text-align: center;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 2em;
    color: #333;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 20px;
}

.purchase-button {
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 8px;
    border: none;
    background-color: #007bff;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
}

.purchase-button:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.purchase-button:active {
    background-color: #004494;
    transform: translateY(0);
}

.sign-in-button {
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 5px;
    border: none;
    background-color: #28a745;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
}

.sign-in-button:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

.sign-in-button:active {
    background-color: #1e7e34;
    transform: translateY(0);
}

#username {
    display: none;
}