dl {
    position: relative;
}
dl dt {
    display: inline;
    border-bottom: dotted 1px;
    cursor: help;
}
dl dd {
    position: absolute;
    z-index: 10;
    visibility: hidden;
    padding: 2px;
    background-color: InfoBackground;
    color: InfoText;
    border: 1px solid InfoText;
    font-family: sans-serif;
    font-size: smaller;
}
dl:hover dd {
    visibility: visible;
}