c9-core/node_modules/frontdoor/example/public/stylesheets/style.css

body {
  padding: 50px;
  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
}

a {
  color: #00B7FF;
}

.done {
    text-decoration: line-through;
}

.done .doneBtn {
    display: none;
}