/* Custom CSS */
div.picture {
   background: #DDDDDD; /*  Dark theme = #333333; Light Theme = #DDDDDD; */
   border: #444444 solid thin;
   text-align: center;
   float: right;
   padding: 5px;
   margin; 0 0 3px 5px;
}

div.equation {
   background: #F3F3F3; /* #333333; #111111; or  F3F3F3; */
   margin:  8px 15px;
   padding: 15px 10px 15px;
   margin: 0 auto;
   border: #444444 1px solid;
   /* color: #000000; */
}

span.mathsymbol {
   font-family: "Times New Roman", Times, serif;
   /* font-style: italic; */
}

span.answer {
   background: #DDDDDD; /* #333333; #444444; or DDDDDD;*/
}

span.caltek {
   background-color:#CCCCCC /* #333333; CCCCCC;*/
   font:"Courier New", Courier, mono !important;
}