* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family:Verdana, Geneva, Tahoma, sans-serif;
    background-color: #8dd4b1;
    margin: 0 auto;
    max-width: 1024px;
    padding: 10px;
    height: auto;
}

/* header + topnav */
.top {
    display: block;
    width: 90%;
    margin: 0 auto;
    padding: 1rem;
    text-align: center;
    border: 0.4rem double green;
    border-radius: 0.8rem;
}
/* topnav */
.topnav {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items:center;
    padding-top: 1rem;
    width: auto;
    margin: auto;
    }
.topnav a {
    padding: 0.3rem;
    border: 0.1rem double black ;
    color: black;
    text-decoration: none; /* removes underline for links */
}
.topnav a:hover {
    background-color:blue;
    color: white;
}