h1 {text-align:center;}

dt { font-weight:bold; }
dd { padding-bottom:2ex; }

ol { list-style-type:decimal; }
ol ol { list-style-type:lower-alpha; }
ol ol ol { list-style-type:lower-roman; }

td { vertical-align: top; }
th { vertical-align: top; }

.ToDo { background-color:grey; }

img { border-width: 0px; }
div.picture_left { margin-right: 1em; margin-top: 1ex; margin-bottom: 1ex; left: 0px; float: left; }
img.picture_left { margin-right: 1em; margin-top: 1ex; margin-bottom: 1ex; left: 0px; float: left; }
div.picture_right { margin-left: 1em; margin-top: 1ex; margin-bottom: 1ex; right: 0px; float: right; }
img.picture_right { margin-left: 1em; margin-top: 1ex; margin-bottom: 1ex; right: 0px; float: right; }
div.picture_center { margin-right: 1em; margin-top: 1ex; margin-bottom: 1ex; left: 1em; float: none; text-align: center; }
img.picture_center { margin-right: 1em; margin-top: 1ex; margin-bottom: 1ex; left: 1em; float: none; text-align: center; }

div.picture_caption { font-style: italic; text-align: center; margin-top: 0.5ex; }

