.spin {
    display: inline-block;
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, .3);
    border-radius: 50%;
    border-top-color: blue;
    animation: spin 1s ease-in-out infinite;
    -webkit-animation: spin 1s ease-in-out infinite;
  }
  @keyframes spin {
    to {
      -webkit-transform: rotate(360deg);
    }
  }
  @-webkit-keyframes spin {
    to {
      -webkit-transform: rotate(360deg);
    }
  }

  .error{
    background-color: red !important;
  }

  .highlight{
    background-color: rgb(47, 206, 255) !important;
  }

  .btn{
    margin: 5px 0px;
  }

  td{
    padding: .2rem .2rem !important;
  }

  table{
    max-width: 550px !important;
  }

  .b-example-divider {
    height: 20px;
  }