.main-navigation li {
display: inline-block;
float: none;
}

.main-navigation > div > ul {
text-align: left;
}

hgroup {
    float: none;
    text-align: center;
    width: 100%;
}
.social-links {
    float: none;
    margin: 1em 0;
    text-align: center;
    width: 100%;
}

p.credits {
        text-align: center
}