style.css

body{
    margin: 0;
    font-family: 'URW Gothic L', 'Century Gothic', sans-serif;
}

nav{
    display: block;

nav .main-menu{
    background: #000;
    margin: 0;
    text-align: center;
    padding: 10px;
}
nav > ul .main-menu{
display: inline;
}
nav .main-menu > li{
    display: inline;
    padding: 10px;
    list-style-type: none;
    text-decoration: none;
    margin: 0 10px;
}
nav a{
    padding: 10px;
    text-decoration: none;
    text-transform: uppercase;
    color: #FFFFFF;
    margin: 0 10px;
}
#toggle-menu{
    display: none;
}
label{
    display: none;
}

/* Media Queries */
@media screen and (max-width: 500px) {

    nav a{
        display: block;
    }
    nav .main-menu > li{
        display: inline;
    }
    label{
        display: block;
        font-size: 30px;
        text-align: center;
        cursor: pointer;
        width: 100%;
        margin: 0 auto;
        color:#FFFFFF;
        background: #000000;
    }
    .main-menu{
        text-align: center;
        display: none;
    }
    #toggle-menu:checked + .main-menu{
        display: block;
    }
}