thelounge-extra.css

/*fix timestamp width in monospace themes*/
#chat.show-seconds .time, #chat.show-seconds .chat-view[data-type="channel"] .msg.highlight .time {
    width: auto;
}

/*hide message sender name if it comes from the same person as the last one*/
.msg.previous-source .from {
visibility: hidden;
}

/*hide debug messages, this should only be added to your extra css if your server admin insists on seeing debug messages*/
#chat .msg[data-type=raw] {
    display: none;
}

/* reverse of above */
/*
#chat .msg[data-type=raw] {
    display: flex;
}
*/