* {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    font-family: Arial;
  }
  
  section{
    width: 90%;
    padding-bottom: 100px;
    margin: 0 auto;
  }
  .header {
    text-align: center;
    padding: 32px;
  }
  
  .row {
    display: -ms-flexbox; /* IE10 */
    display: flex;
    -ms-flex-wrap: wrap; /* IE10 */
    flex-wrap: wrap;
    padding: 0 4px;
  }
  
  /* Create four equal columns that sits next to each other */
  .column {
    -ms-flex: 25%; /* IE10 */
    flex: 25%;
    max-width: 25%;
    padding: 0 4px;
  }
  
  .column img {
    margin-top: 8px;
    vertical-align: middle;
    width: 100%;
    border-radius: 25px;
  }
  


/* Fullscreen Image Overlay styles */
.fullscreen-overlay {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 9999; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
  }
  
  .fullscreen-image {
    margin: auto;
    display: block; /* Center the image */
    max-width: 80%; /* Max width */
    max-height: 80%; /* Max height */
    margin-top: 50px;
  }
  
  /* Close Button */
  .close-btn {
    position: absolute;
    top: 25px;
    right: 35px;
    color: white;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
  }

  /* Responsive layout - makes a two column-layout instead of four columns */
  @media screen and (max-width: 800px) {
    .column {
      -ms-flex: 50%;
      flex: 50%;
      max-width: 50%;
    }
  }
  
  /* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
  @media screen and (max-width: 600px) {
    .column {
      -ms-flex: 100%;
      flex: 100%;
      max-width: 100%;
    }
  }