ck-ops/code/grafana/public/sass/pages/_signup.scss

.signup-page-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  height: 100%;
  width: 100%;
  background-image: url(/img/background_tease.jpg);

  .signup-logo-container {
    width: 150px;
    margin: 0 auto;
    padding: 80px 0;
  }
}