body {
    margin: 0;
}

nav {
    display: flex;
    justify-content: center;
}

nav ul {
    width: 200px;
    display: flex;
    flex-direction: column;
    list-style-type: none;
    padding: 0;
    margin: 0;
}

nav li {
    line-height: 50px;
    margin: 2px 0 0 2px;
}

nav a {
    text-align: center;
    color: black;
    text-decoration: none;
    padding: 0 20px;
    display: block;
}

nav .active a,
nav a:hover{
	background: green;
    color: white;
}

.content h1, p {
    margin: 20px;
}

.content a {
    color: white;
    text-decoration: none;
    background-color: green;
    padding: 15px 20px;
}

.content a:hover {
    color: black;
    background-color: rgba(255, 255, 255, 0.4);
}

section {
    border-top: 10px solid blue;
    background-color: lightblue;
    min-height: 100vh;;
}