Dark tabs for Arc GTK theme in terminator

gtk.css

/* 
Put these lilnes into .config/gtk-3.0/gtk.css file
(Probably you'll need to create it)
*/
.terminator-terminal-window notebook tab {
    background-color: #383c4a;
    padding: 0.2em;
    border: none;
}

.terminator-terminal-window notebook tab:checked {
    background-color: #404552;
    background-image: none;
    border: 1px solid #2c2e32;
}

.terminator-terminal-window notebook tab label {
    color: #a8aeb8;
}

.terminator-terminal-window notebook tab:checked label {
    color: #d1d5dc;
    font-weight: 500;
}

.terminator-terminal-window notebook tab button {
    padding: 0;
    background-color: transparent;
    color: #ccc;
}

.terminator-terminal-window notebook header {
    background-color: #383c4a;
}

.terminator-terminal-window notebook tab button:hover {
    border: 0;
    background-image: none;
    border-color: #444;
    border-style: solid;
    border-width: 1px;
}