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

.container {
    width: 300px;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
}

#responseMessage {
    text-align: center;
    color: green;
}

.menu {
    position: relative;
    display: inline-block;
}

.hamburger {
    font-size: 24px;
    cursor: pointer;
    background: none;
    border: none;
}

.menu-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.menu-content button {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
}

.menu-content button:hover {
    background-color: #f1f1f1;
}

.menu.show .menu-content {
    display: block;
}