body {
    margin: 0;
    padding: 0;
    font: 1em/1.2 "Helvetica Neue", Helvetica, Arial, Geneva, sans-serif;
    color: #333;
}

p {
    margin: 0 0 1.5em;
    line-height: 1.5;
}

h1 { 
    font-size: 2.25em;  
} /* 36px */
h2 { 
    font-size: 1.75em;  
} /* 28px */
h3 { 
    font-size: 1.375em;  
} /* 22px */
h4 { 
    font-size: 1.125em;
} /* 18px */
h5 { 
    font-size: 1em;
} /* 16px */
h6 { 
    font-size: .875em;  
} /* 14px */


.header {
    padding: 1em 1.25em;
    background-color: #555;
    color: #FFF;
}

.header-heading {
    margin: 0;
}

.content {
    overflow: hidden;
    padding: 1em 1.25em;
    background-color: #FFF;
}

.container {
    max-width: 70em;
    margin: 0 auto;
}

.nav-bar {
    background-color: #000;
    padding: 0;
}

.nav {
    margin: 0;
    padding: 0;
    list-style: none;

}

.nav li {
    display: inline;
    margin: 0;

}

.nav a {
    display: block;
    padding: .7em 1.25em;
    color: #fff;
    text-decoration: none;
    border-bottom: 1px solid gray;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 .5em;
    font-weight: 500;
    line-height: 1.1;
}

.footer {
    background-color: #000;
    color: #FFF;
    padding: 1em 1.25em;
}

#unix-content {
    padding-bottom: 20%;
}

#unix-img {
    width: 350px;
    height: 200px;
    float: left;
    padding: 0 24px 24px 0;
}

#unix-body-head {
    padding-bottom: 24px;
}

#wvl-img {
    width: 300px;
    height: 200px;
    float: left;
    padding: 0 24px 24px 0;
}

.meme {
    width: 200px;
    height: 200px;
    display: inline;
    padding: 24px;
}

@media (min-width: 55em)
{
    .header {
        padding: 1.5em 3em;
    }

    .content {
        padding: 2em 3em;
    }

    .main {
        float: left;
        width: 65%;
        margin-right: 5%;
        margin-bottom: 1em;
    }

    .footer { 
        padding: 2em 3em;
    }

    .nav-bar {
        padding: 1em 3em;

    }

    .nav li {
        display: inline;
        margin: 0 1em 0 0;
    }
    .nav a {
        display: inline;
        padding: 0;
        border-bottom: 0;
    }

    .nav li a.active {
        color: #FFF;
    }

    .nav li a:hover:not(.active) {
        color: #FFF;

    }

    .nav li a {
        color: grey;

    }

}