.youtube-video-frame {
    width: 100%;
    height: 420px;
    max-width: 750px;    
    display: block;
    margin: auto;    
}

.s-content a.heading-link{
	text-decoration:none;
	color: black;
}

a.heading-link h1{
	cursor: pointer;
}

body, 
.Nav .Nav .Nav__item a{
	font-family: "Helvetica Neue","Lucida Grande",Arial,sans-serif;
}

.version_notice{
	  background: #dff0d8;
    color: #3c763d;
    line-height: 1.5;
    overflow: auto;
    border: 0;
    border-radius: 0;
    padding: 0.75em 2em;
    margin: 0 -20px 20px;
}

.s-content code{
	line-height:1.6
}