Bootstrap Image Grid (responsive)

<!--You Can See Online Here :
https://codepen.io/sibche2013/pen/WNXWjyB -->

<!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%;
  }
}

/* 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%;
  }
}
</style>
<body>

<!-- Header -->
<div class="header">
  <h1>Bootstrap Responsive Image Grid</h1>
  <p>Resize the browser window to see the responsive effect.</p>
</div>
<div class="row">
  <div class="column">
    <img src="https://i.ibb.co/9N66jGM/1.jpg">
    <img src="https://i.ibb.co/kSRxQC2/2.jpg">
    <img src="https://i.ibb.co/8r1GyHz/3.jpg">
  </div>
  <div class="column">
    <img src="https://i.ibb.co/WWt4vMv/4.jpg">
    <img src="https://i.ibb.co/hdYj3mF/5.jpg">
    <img src="https://i.ibb.co/NZWR2CW/6.jpg">
  </div>
  <div class="column">
    <img src="https://i.ibb.co/wzpJ8vc/7.jpg">
    <img src="https://i.ibb.co/yVGFPPw/8.jpg">
    <img src="https://i.ibb.co/wzpJ8vc/7.jpg">
  </div>
  <div class="column">
    <img src="https://i.ibb.co/kSRxQC2/2.jpg">
    <img src="https://i.ibb.co/1s2NR9J/11.jpg">
    <img src="https://i.ibb.co/8r1GyHz/3.jpg">
  </div>
</div>
  
  
</body>
</html>
Amin Arjmand