atom/static/atom.css

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#root-view {
  height: 100%;
  overflow: hidden;
  position: relative;
}

.is-dev-mode #root-view:before {
  content: "";
  height: 3px;
  display: block;
  background-image: -webkit-linear-gradient(#ffc833, #ebac00);
  border-bottom: 1px solid #000;
}

#root-view #horizontal {
  display: -webkit-flex;
  height: 100%;
}

#root-view #vertical {
  display: -webkit-flex;
  -webkit-flex: 1;
  -webkit-flex-flow: column;
}

#root-view #panes {
  position: relative;
  -webkit-flex: 1;
}

#root-view #panes .column {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow-y: hidden;
}

#root-view #panes .row {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow-x: hidden;
}

#root-view #panes .pane {
  position: absolute;
  display: -webkit-flex;
  -webkit-flex-flow: column;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  box-sizing: border-box;
}

@font-face {
  font-family: 'Octicons Regular';
  src: url("octicons-regular-webfont.woff") format("woff");
  font-weight: normal;
  font-style: normal;
}

.is-loading {
  background-image: url(images/spinner.svg);
  background-repeat: no-repeat;
  width: 14px;
  height: 14px;
  opacity: 0.5;
  background-size: contain;
  position: relative;
  display: inline-block;
  padding-left: 19px;
}