.kc.main {
  width: 100%;
  background-color: #edd;
}
.kc.main.with-sidebar {
  background-color: #cce;
}
@media (min-width: 560px) {
  .kc.main.with-sidebar {
    width: calc(100% - 13rem);
    margin-left: 13rem;
  }
}