userChrome.css snippet for Thunderbird to have pretty labels

pretty_thunderbird_labels.css

/* Default Important Label */
treechildren::-moz-tree-cell(lc-FF0000) {
    border-bottom: 1px solid #FF0000 !important; background-color: #FFCCCC !important;
}
treechildren::-moz-tree-cell-text(lc-FF0000) {
    color: #000000 !important;
}
treechildren::-moz-tree-cell(lc-FF0000, selected) {
    background-color: #FF0000 !important;
}
treechildren::-moz-tree-cell-text(lc-FF0000, selected) {
    color: #FFFFFF !important;
}

/* Default Work Label */
treechildren::-moz-tree-cell(lc-FF9900) {
    border-bottom: 1px solid #FF9900 !important;
    background-color: #FFCC99 !important;}
treechildren::-moz-tree-cell-text(lc-FF9900) {
    color: #000000 !important;
}
treechildren::-moz-tree-cell(lc-FF9900, selected) {
    background-color: #FF9900 !important;
}
treechildren::-moz-tree-cell-text(lc-FF9900, selected) {
    color: #FFFFFF !important;
}

/* Default Person Label */
treechildren::-moz-tree-cell(lc-009900) {
    border-bottom: 1px solid #009900 !important;
    background-color: #99FF99 !important;}
treechildren::-moz-tree-cell-text(lc-009900) {
    color: #000000 !important;
}
treechildren::-moz-tree-cell(lc-009900, selected) {
    background-color: #009900 !important;
}
treechildren::-moz-tree-cell-text(lc-009900, selected) {
    color: #FFFFFF !important;
}

/* Default Todo Label */
treechildren::-moz-tree-cell(lc-3333FF) {
    border-bottom: 1px solid #3333FF !important;
    background-color: #CCCCFF !important;}
treechildren::-moz-tree-cell-text(lc-3333FF) {
    color: #000000 !important;
}
treechildren::-moz-tree-cell(lc-3333FF, selected) {
    background-color: #3333FF !important;
}
treechildren::-moz-tree-cell-text(lc-3333FF, selected) {
    color: #FFFFFF !important;
}

/* Default Later Label */
treechildren::-moz-tree-cell(lc-993399) {
    border-bottom: 1px solid #993399 !important;
    background-color: #FFCCFF !important;}
treechildren::-moz-tree-cell-text(lc-993399) {
    color: #000000 !important;
}
treechildren::-moz-tree-cell(lc-993399, selected) {
    background-color: #993399 !important;
}
treechildren::-moz-tree-cell-text(lc-993399, selected) {
    color: #FFFFFF !important;
}