chrome-extensions-samples/apps/samples/platform-title/main.css

* {
  font: inherit;
  color: inherit;
  margin: 0;
  padding: 0;
}

html {
  overflow: hidden;
}

body {
  background: rgba(255, 255, 255, 0.5);
  font-size: 16px;
  line-height: 24px;
  font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif;
  font-weight: 300;
  overflow: hidden;
  font-weight: 300;
}

p {
  margin-bottom: 8px;
}

.scroll {
  position: absolute;
  top: 2em;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: visible;
  overflow-x: hidden;
  padding: 8px 24px;
  text-align: justify;
}

.titlebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2em;
  line-height: 2em;
  background: #7489fc;
  transition: all 0.25s;
  text-align: center;
  color: white;
  -webkit-app-region: drag;
  app-region: drag;
}

.titlebar h1 {
  font-size: 1.5em;
}

.titlebar .buttons {
  margin: 0 8px;
  display: block;
  float: right;
  font-size: 1em;
  transition: 0.25s all;
  word-wrap: none;
  text-overflow: visible;

  /**
   * Mac supports dragging of interactive elements; ChromeOS (possibly others)
   * makes the buttons unusable unless the drag bit is cleared.
   */
  -webkit-app-region: no-drag;
  app-region: no-drag;
}

.titlebar .buttons button {
  padding: 0;
  margin: 0;
  display: inline-block;
  border: 0;
  min-width: 2em;
  text-align: center;
  background: transparent;
  cursor: pointer;
  margin-right: 4px;
  position: relative;
  background: rgba(0, 0, 0, 0.1);
  transition: all 0.25s;
}

.titlebar .buttons button:focus {
  outline: 0;
}

.titlebar .buttons button:active {
  color: rgba(255, 255, 255, 0.75);
}

.titlebar .buttons button:hover {
  background: rgba(255, 255, 255, 0.25);
}

.titlebar.shadow {
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.3);
  background: #fd6598;
}

.titlebar.fullscreen button.window {
  display: none;
}