body {
    background-image: url('images/background.jpg');
    font-family: Optima, 'Lucida Sans Unicode', sans-serif;
    color: #424242;
    font-size: 14pt;
    margin: 0px;
}

h1 {
    font-size: 24pt;
    font-weight: normal;
    margin-top: 2em;
    margin-bottom: 2.5em;
}

h2 {
    font-size: 16pt;
    font-weight: normal;
    margin-top: -2.5em;
    margin-bottom: 3em;
}

h1, h2 {
    text-align: center;
}

h1, h2, #content {
    margin-left: 10%;
    margin-right: 10%;
}

#content {
    margin-bottom: 4em;
}

ol {
    margin-left: 0.2em;
}

ol, ul {
    margin-bottom: 2em;
}

ul {
    list-style-type: disc;
}

li {
    margin: 1em;
}

#top, #bottom {
    font-size: 10pt;
    background-color: white;
    margin: 0px;
    font-family: sans-serif;
    border-bottom: 1px solid black;
}

#top {
    padding: .1em .3em .2em .3em;
}

#bottom {
    border-top: 1px solid black;
    padding: .2em .3em .2em .3em;
}

#top a, #bottom a {
    text-decoration: none;
}

a#start, a#previous {
    display: block;
    float: left;
}

a#contents {
    text-align: center;
    margin: auto;
    display: block;
}

a#next {
    display: block;
    float: right;
}

a#previous:before {
    content: "« ";
}

a#next:after {
    content: " »";
}

.float.left {
    float: left;
}

.float.right {
    float: right;
}

a.erklaerung {
    font-size: smaller;
}

.attention, .equation {
    margin: auto;
    text-align: left;
    background-repeat: no-repeat;
    margin-top: 2em;
}

.attention {
    width: 42%;
    background-image: url('images/attention.png');
    font-weight: bold;
    padding-left: 60px;
    min-height: 60px;
    line-height: 2.3em;
}

.single.equation {
    line-height: 5em;
}

.equation {
    width: 60%;
    background-image: url('images/chemicals.png');
    padding-left: 120px;
    min-height: 110px;
    margin-top: 3em;
}

.equation img {
    position: relative;
    top: 2px;
    left: 1px;
}

.equation .marginal {
    margin-bottom: .5em;
}

.equation .double.marginal {
    margin-top: .5em;
}

.smaller {
    font-size: smaller;
}

.smallest {
    font-size: small;
}

.indented {
    display: block;
    margin-left: 1em;
}

.equation .smaller {
    line-height: 16pt;
}

.green {
    border: 1px solid #b9e290;
    background: #dbf8c1;
    
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#e9ffcd', endColorstr='#ccfb9d');
    background: -webkit-gradient(linear, left top, left bottom, from(#e9ffcd), to(#ccfb9d));
    background: -moz-linear-gradient(top,  #e9ffcd,  #ccfb9d);
}

hr {
    margin-top: 3em;
    margin-bottom: 4em;
    height: 0px;
    border: 0px solid black;
    border-top: 1px solid #aaa;
}