nav {
    color: white;
    float: left;
    margin: 50px 0px;
    padding: 20px;
    width: 48%;
}
nav ul {
    line-height: 200%;
}
article {
    background-color: white;
    border-bottom-right-radius: 50px;
    border-top-right-radius: 50px;
    float: left;

    margin-top: 30px;
    padding: 0px 20px 0px 50px;
    width: 52%;
}
section:after {
    content: "";
    display: table;
    clear: both;
}
@media (max-width: 600px) {
  nav, article {
    width: 100%;
    height: auto;
  }
}