.main-header .logo {
        font-weight: bold;
        font-size: 24px;
      }

     .center {
        display: flex;
        justify-content: center;
        align-items: center;
        height: 80vh;
     }
           .center2 {
        display: flex;
        justify-content: center;
        align-items: center;
      }

 img {
        max-height: 100%;
        max-width: 100%;
      }

      .screeneritem {
        height: 100vh;
        width: 56.25vh;
        margin: auto;
      }
      
              .titlecontainer {
        position: relative;
        width: 0;
        height: 0;

      }
      
      
        .titlebox {
        position: absolute;
        font-size: 32pt;
        top: 3%;

      }

      .answer {
        display: inline-block;
        width: 24%;
      }
      .ans-image:hover {
        box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
      }

      .stem {
        height: 50%;
      }

      .answers {
        height: 50%;
      }

      .answersrow {
        padding-top: 4%
      }

      .shiny-input-container:not(.shiny-input-container-inline) {
        width: 100%;
      }
      .answer-radio {
        display: none;
      }
      .answer-radio:checked + label > img {
        box-shadow: 0 0 0 4px blue;

      }
      .answer-radio + label > img {
        padding: 4%;
      }
      .stem-image-container {
        text-align: center;
        width: 77.5%;
        margin: auto;
        padding-top: 20%;
      }
      label {
        margin: auto;
      }
      .button-container {

      }
      .enter-ans-button-container {
      float: right;
      padding-top: 5%;

      }