body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f4f4f4;
}

button#userButton {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: rgb(128, 128, 128);
    color: white;
    font-size: 20px;
    border: none;
    outline: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

button#userButton:hover {
    background-color: darkgray;
}