miksi-app/css/dark-theme.css

.dark-theme {
  background: #232729;
  color: #d9d9d9;
}
.dark-theme
      .card,
      .list-group-item,
      input,
      textarea,
      .nav-link {
  background: none!important;
  border-color: #3b4145;
}
.dark-theme input, textarea {
  color: #FF00B9!important;
}
.dark-theme input:focus, textarea:focus {
  color: #FF00B9!important;
  box-shadow: 0px 0px 5px #FF00B9!important;
  border: none;
}