.fehler { color:red; font-weight:bold; }
option { height:20px; vertical-align:center;}
.widerstand, .widerstand td { border:1px solid black; }
.berechnen { border:1px solid black; background-color:#0090E0; padding:2px; }
a.infobox { border-bottom: 1px dashed #c30; text-decoration:none; }
a.infobox:hover { cursor:help; color:#c30; background:white; }
a.infobox span { visibility:hidden; position:absolute; left:-99em; margin-top:1.5em; padding:1em; text-decoration:none; }
a.infobox:hover span, a.infobox:focus span, a.infobox:active span { visibility:visible; left:1em;
                                                                    border:1px solid #c30;
                                                                    color:black;
                                                                    background:white; }