body	 { margin: 1% 9% 5% 9% }
main	 { line-height: 1.75em;
	   font-size: large }
nav	 { justify-content: space-between;
	   font-size: 150%;
	   display: flex }
h1	 { margin-top: 2em }
ol	 { list-style-type: none }
main > p { text-indent: 1.5em }
p.c	 { text-align: center }
p.r	 { text-align: right;
	   color: gray }
.sur	 { display: inline-block;
	   float: right }
a	 { text-decoration: none }
a:hover	 { color: red }