body { text-align:justify; width:75%; margin:20px auto 0px auto; }
p:first-of-type { margin-bottom:40px; }
pre:not([class]) { background-color:inherit!important; color:inherit!important; }
.math.display { width:40%; float:left; margin:10% auto; }
span + br + img { margin:2% 0 3% 3%; max-width:54%; }
img { max-width:100%; }
iframe { display:block; margin:auto; }