[Settings] > Miscellaneous > Custom CSS > Tick box to enable > [Edit] > Paste the following:

.quote {
color: #80DB90 !important;
text-shadow: 0 0 5px #80DB90, 0 0 15px #80DB90, 0 0 25px #A4E5B0;
}


Save Settings > Scroll down on main settings page > Save Settings again

Enjoy :)