Answers for "css defer loading"

css defer async

<link rel="stylesheet" href="style.css" media="print" onload="this.media='all'">

css loading

.Overlay {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  .LoadingContainer {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    .Spinner {
      color: #007bff;
    }
  }
}