body {
    font-size: .875rem;
  }
  
  main {
    line-height: 28px;
  }
  .thumbnail {
    max-height: 180px;
    margin: 24px;
    border: 2px solid #ecf0f1;
    box-shadow: 2px 2px 6px rgb(0 0 0 / 40%);
    cursor: pointer;
    max-width: 100%;
  }
  .nav-link i {
    width: 18px;
    text-align: center;
  }
  h1 {
    border-bottom: 1px solid #000;
    padding-bottom: 14px;
    margin-bottom: 24px;
  }
  h2 {
    font-size: 24px;
  }
  h2,h3 {
    margin-top: 24px;
  }
  p {
    margin: 0px;
  }
  section ul {
    margin-top: 14px;
  }
  .btn-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
  }
  .btn-primary {
    background-color: #1abc9c;
    border-color: #1abc9c;
  }
  .btn-primary:hover {
    background-color: #16a085;
    border-color: #16a085;
  }

  .feather {
    width: 16px;
    height: 16px;
    vertical-align: text-bottom;
  }
  
  /*
   * Sidebar
   */
  
  .sidebar {
   /* position: fixed;*/
    top: 0;
    /* rtl:raw:
    right: 0;
    */
    bottom: 0;
    /* rtl:remove */
    left: 0;
    z-index: 100; /* Behind the navbar */
    padding: 0px; /* Height of navbar */
    box-shadow: inset -1px 0 0 rgba(0, 0, 0, .1);
  }
  
  @media (max-width: 767.98px) {
    .sidebar {
      top: 5rem;
    }
  }
  
  .sidebar-sticky {
    position: relative;
    top: 0;
    height: calc(100vh - 48px);
    padding-top: .5rem;
    overflow-x: hidden;
    overflow-y: auto; /* Scrollable contents if viewport is shorter than content. */
  }
  
  .sidebar .nav-link {
    font-weight: 500;
    color: #333;
  }
  
  .sidebar .nav-link .feather {
    margin-right: 4px;
    color: #727272;
  }
  
  .sidebar .nav-link.active {
    color: #2470dc;
  }
  
  .sidebar .nav-link:hover .feather,
  .sidebar .nav-link.active .feather {
    color: inherit;
  }
  
  .sidebar-heading {
    font-size: .75rem;
    text-transform: uppercase;
  }
  
  /*
   * Navbar
   */
  
  .navbar-brand {
    padding-top: .75rem;
    padding-bottom: .75rem;
    font-size: 1rem;
    box-shadow: inset -1px 0 0 rgba(0, 0, 0, .25);
    word-wrap: normal;
    white-space: normal;
    font-size: 18px;
    line-height: 48px;
  }
  
  .navbar .navbar-toggler {
    top: .25rem;
    right: 1rem;
  }
  
  .navbar .form-control {
    padding: .75rem 1rem;
    border-width: 0;
    border-radius: 0;
  }
  
  .form-control-dark {
    color: #fff;
    background-color: rgba(255, 255, 255, .1);
    border-color: rgba(255, 255, 255, .1);
  }
  
  .form-control-dark:focus {
    border-color: transparent;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, .25);
  }
  #imgPreview{
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.4);

    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
  }
  #imgPreview img {
    /*width: 60%;*/
    max-width: 80%;
    max-height: 80%;
    border: 4px white solid;
    border-radius: 5px;
}
.hidden {
  display: none !important;
}
pre {  
  margin-top: 1rem;
  margin-left: 28px;
}