layout.css

/**
 * @file
 * Component Layout CSS and some Page layout overrides
 */

.l-header {
  position: relative;
  margin: 0 0 2rem;
}

.layout .l-messages {
  margin: 0 0 2rem;
}

/* Push the footer down to the bottom of the page. */
.layout {
  box-sizing: border-box;
  height: 100vh;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
}
.admin-bar body .layout {
  padding-top: 33px;
  margin-top: -33px;
}
.l-wrapper {
  -webkit-flex: 1 0 auto;
  -ms-flex: 1 0 auto;
  flex: 1 0 auto;
}
.l-header,
.l-footer {
  -webkit-flex: 0 0 auto;
  -ms-flex: 0 0 auto;
  flex: 0 0 auto;
}