body {
    background-color: #3f3f3f;
    color:            #dcdccc;
    font-size:        18px;
    font-weight:      400;
    line-height:      1.6;
    margin:           40px auto;
    max-width:        650px;
    padding:          0 10px;
}

.heading {
    text-align:       center;
}

h1, h2, h3 {
    line-height: 1.2;
}

code {
    background-color: #2b2b2b;
    color: #cc9393;
    padding: 0.1em 0.25em 0.1em 0.25em;
    border-radius: 5px;
}