[data-include], #header:empty, #footer:empty, #quick:empty {
  display: contents;
}

.include-error {
  position: relative;
  z-index: 9999;
  margin: 10px 0;
  padding: 15px;
  color: #c00;
  font-family: sans-serif;
  font-size: 14px;
  text-align: center;
  background: #fee;
  border: 1px solid #c00;
}