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<!DOCTYPE html>
<html>
<style>
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: Arial;
}
.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%;
}
/* 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%;
  }
}