custom-qlik-styles.css

/* Custom text for filter panes */
.qv-collapsed-listbox .title-wrapper .title {
    flex: 1 1 auto;
    box-sizing: border-box;
    -webkit-text-overflow: ellipsis;
    text-overflow: ellipsis;
    overflow: hidden;
    font-size: 13px;
    font-weight: 700;
    padding: 0 8px;
    color: #E1E1E1;
    background-color: #121212;
    font-family: 'Open Sans';
    text-align: left;
}