body {
    background-color: white;
}
p {
    color: black;
}
li {
    color: black;
}
.topnav {
    background-color: green;
    width: 100%;
    overflow: auto;
}
.topnav a {
    float: left;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}
.topnav a:hover {
    background-color: grey;
    color: black;
}
.topnav a.active {
    background-color: black;
    color: white;
}
.button {
    text-align: center;
    font-size: 80px;
}