app.css

body {
    font-family: PolySans;

}

nav {
    padding: 20px;
    text-transform: uppercase;
    color: #ccc;
}

.main-content {
    padding: 20px;
}

.main-content h1 {
    font-size: 40px;
}

.main-content p {
    font-size: 20px;
}

.btn {
    background: rebeccapurple;
    color: #fff;
    padding: 10px;
    outline: 0;
    border: 0;
    font-size: 18px;
    border-radius: 10px;
}

footer {
    color: #ccc;
    padding: 20px;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
}