BODY {
 font-family: arial;
}
BODY, DIV, TABLE {
 box-sizing: border-box;
}

TABLE {
 border-spacing: 0;
}
TABLE.overview TH,
TABLE.overview TD {
 border: 1px solid #dddddd;
 padding: 5px 7px;
}
TABLE.overview TH {
 width: 20px;
 writing-mode: vertical-rl;
 font-weight: normal;
}

TD.extendable SPAN {
 display: inline;
}
TD.extendable:hover SPAN {
 display: none;
}
TD.extendable P {
 display: none;
}
TD.extendable:hover P {
 display: block;
}