body { color: black ; background: #D0FFE0 }
h1 { text-align: center }
h2.concept { text-align: center; font-family: italic }
h3.toc { font-family: bold ; font-family: italic ;
         margin-left: 30px ; margin-right: 30px } }
div { padding-top: 10px ; margin-left: 30px ; margin-right: 30px }
div.toc { background: #D0E0F0 }
div.quiz { background: #D0E0F0 }
div.concept { background: #FFF8B8 ; padding-top: 0px ;
	padding-left: 80px; padding-right: 80px }
div.concept_title { background: #FFF8B8 ;
	padding-left: 80px; padding-right: 80px ;
	text-align: center ; font-family: italic }
div.abstract { font-family: italic }
pre { margin-top: 0px ; margin-bottom: 0px ; padding: 0px ; margin-left: 30px }