atom/static/atom.css

* {
  margin: 0;
  padding: 0;
}

body {
  font-family: Lucida Grande;
  font-size: 12px;
  overflow: hidden;
}

#app-horizontal {
  background-image: url(images/linen.png);
  display: -webkit-box;
  min-height: 100%;
  -webkit-box-orient: horizontal;
}

#app-vertical {
  display: -webkit-box;
  -webkit-box-flex: 1;
  -webkit-box-orient: vertical;
  background-color: red;
}

#main {
  position: relative;
  display: -webkit-box;
  -webkit-box-flex: 1;
  -webkit-box-orient: vertical;
  background-color: yellow;
}

.pane {
  display: -webkit-box;
  background-color: blue;
}

.editor {
  font: 18px Inconsolata, Monaco, Courier !important;
  width: 100%;
  height: 100%;
  background: #333;
  color: white;
}

.editor .cursor {
  background: #9dff9d;
  opacity: .3;
}