* {
    box-sizing: border-box;
}

html, body {
    padding: 0;
    margin: 0;
}

html { 
    background-color: #181818; 
}

body {
    color: white;
    font-size: 18px;
    font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
    line-height: 1.7;
}

div.main {
    padding: 40px;
    max-width: 950px;
}

header { 
    padding: 40px;
    background-color: white;
    overflow: hidden;
}

h1 {
    margin: 0;
    padding: 50px 0 20px 0;
    font-size: 200%;
    opacity: 0.9;
}
h2 {
    margin: 0;
    padding: 10px 0 10px 0;
    font-size: 150%;
    opacity: 0.8;
}

code, pre {
    background-color: green;
    padding: 20px;
    display: block;
    margin: 20px;
    font-family: "Courier New", Courier, monospace;
    opacity: 1;
    overflow: auto;
}

body h1:first-of-type {
    padding-top: 0;
}

div#screenshots {
    text-align: center;
}

div#screenshots img {
    max-width: 650px;
    max-height: 347px;
    margin: 10px;
}

a { 
    color: #afafaf;
}
@media only screen and (max-width: 600px) {

    body {
        font-size: 16px;
        width: 100%;
    }

    code, pre {
        margin: 20px 0;
    }

    div#screenshots img {
        max-height: 100px;
    }

}