table {
    row-span: 0;
    column-span: 0;
    margin: 0;
    padding: 0;
    border-spacing: 0;
}
table tr {
    margin: 0;
    padding: 0;
}
table tr.even {
    background-color: #f5f5f5;
}
table tr td {
    padding-left: 10px;
    padding-right: 10px;
    vertical-align: middle;
}

td.button {
    text-align: center;
}
td.button a {
    width: 25px;
    height: 25px;
    margin: 0;
    padding: 0;
    display: inline-block;
}

a.active {
    background-color: greenyellow;
}
a.passive {
    background-color: indianred;
}
a.unknown {
    background-color: darkgray;
}

div.button {
    display: inline-block;
    width: 21px;
    height: 21px;
    padding: 0;
    margin: 0;
}
div.automated {
    border: 2px solid black;
    border-radius: 15px;
}