My take on the fman default css. Improved visibility especially in the locationbar.

Theme.css

* {
    font-size: 9pt;
    font-family: "Segoe UI", monospace;
}

th {
    padding: 1ex 2ex 3ex 2ex;
    font-size: 10pt;
    border: 1px solid #34352f;
    border-bottom: none;
    line-height: normal;
}

.locationbar {
    font-size: 9.5pt;
    padding: 1ex;
    border-top: 2px inset #2c2b2b;
    border-left: 2px inset #2c2b2b;
    border-right: 2px inset #2c2b2b;
    font-weight: 500;
    color: #b5b2b4;
}

.statusbar {
    font-size: 8pt;
    font-weight: bold;
}

.quicksearch-query,
.quicksearch-item-title {
    font-size: 11pt;
}

.quicksearch-item-hint {
    font-size: 9pt;
}