table {
    width: 80%;
}

td {
    width: 30px !important;
    text-align: center;
}

table.center_table {
    margin-left: auto;
    margin-right: auto;
}




.gr23 {
    background-color: #ccffcc;
    text-align: center;
    border: solid 1px gray;
}
.elem {
    background-color: #AED6F1;
    text-align: center;
    border: solid 1px gray;
}

.middle {
    background-color: #FCF3CF;
    text-align: center;
    border: solid 1px gray;
}

.high {
    background-color: #EBDEF0;
    text-align: center;
    border: solid 1px gray;
}

.no {
    background-color: lightgray;
}

div.spacer {
    /* margin-bottom: 2em; */
}

ul.ul_spacer li {
    margin-bottom: 12px;
}