body {
    margin: 0;
    overflow: hidden;
    font-family: Arial, sans-serif;
}

#container {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    display: block;
}

/* Login Button */
.login-btn {
    position: absolute;
    top: 10px;
    right: 20px;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.login-btn:hover {
    background-color: #0056b3;
}

/* Modal Styles */
.modal {
    display: none; /* Hidden by default */
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: white;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 30%;
    border-radius: 10px;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover, .close:focus {
    color: black;
    cursor: pointer;
}

.modal-content input {
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    box-sizing: border-box;
}

.modal-content button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

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