html {
    height: 100%;
    width: 100%;
}
body {
    font: 100% Arial,sans-serif;
    background: #fff url(grijs.png) repeat-x top left;
    color: #000;
    width: 80%;
    margin: auto;
    padding-bottom: 1em;
}
h1 {
    margin: 0;
    padding: 0;
    text-align: center;
    width: 100%;
    height: 100px;
    line-height: 100px;
    position: absolute;
    top: 0;
    left: 0;
    font-size: 2.5em;
}
#navigation {
    list-style: none;
    margin-top: 115px;
    margin-bottom: 15px;
    width: 100%;
    text-align: center;
}
#navigation li {
    display: inline;
}
#navigation li:before {
    content: "|";
    margin-left: .5em;
    margin-right: .5em;
}
#navigation li:first-child:before {
    content: "";
}
#navigation a,#navigation a:visited {
    font-size: 1.1em;
    font-weight: bold;
    display: inline-block;
}
#navigation a:link, #navigation a:visited {
    color: #00e;
}
#spelen button, #instellen button {
    width: 100%;
}
h2 {
    font-weight: bold;
    font-size: 1.4em;
    margin-bottom: 0;
}
h3 {
    font-weight: bold;
    font-size: 1.2em;
    margin-bottom: 0;
}
p {
    margin-top: 0;
    line-height: 140%;
}
img.wiskunde {
    vertical-align: middle;
}