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

header, nav{
    background-color: #003366;
    color: white;
    padding: 8px;
    text-align: center;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
}

li{
    text-align: center;
    display: inline;
    margin: auto 10px;
}

li > a {
    text-decoration: none;
    color: rgb(255, 255, 255);
    font-size: 19px;
}

@media screen and (max-width: 320px) {
    li > a{
        font-size: 16px;
    }
}