Retrospring/app/assets/stylesheets/scss/panel.scss

.panel-primary .text-muted a, .panel-primary .text-muted a:hover {
  color: #fff;
  text-decoration: none;
  opacity: 1;
}

.panel-primary .text-muted {
  color: #fff;
  opacity: 0.7;
}

.panel-primary .answerbox--question-text {
  color: #fff;
}