body {
    margin: 0;
    padding: 0;
    background-color: #ddf1ff
}

h1 {
    color: blue;
}

a {
    text-decoration: none;
}

    a:hover {
        background-color: green;
        color: white;
    }

#menu {
    position: absolute;
    background-color: blue;
    white-space: nowrap;
}

    #menu a {
        display: inline-block;
        padding: 10px 20px;
        text-decoration: none;
        color: white;
    }


.active {
    background-color: green;
}


.button {
    display: inline-block;
    padding: 10px 20px;
    color: white;
    background-color: blue;
    border-radius: 5px;
    text-decoration: none;
    position: absolute;
    transition: background-color 0.3s ease;
}

    .button:hover {
        background-color: green;
    }