h1{
    font-size:120%
}
div.tables{
    border:  medium dotted #ff0000
}
div.q {
    margin-left: 20px;
    margin-right: 20px;
    margin-top: 30px;
    padding: 25px;
    width: 100px;
    background-color: #ffffff;
    float: left;
    border:  medium dotted #000000
}
span.op{
    font-weight: bold;
    font-size: 110%;
    padding: 5px;
}
span.nb{
    font-size: 110%;
    padding: 2px;
}