zig Tryit Editor

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}
.header {
  text-align: center;
  padding: 32px;
}
.row {
  display: -ms-flexbox; /* IE 10 */
  display: flex;
  -ms-flex-wrap: wrap; /* IE 10 */
  flex-wrap: wrap;
  padding: 0 4px;
}
/* Create two equal columns that sits next to each other */
.column {
  -ms-flex: 50%; /* IE 10 */
  flex: 50%;
  padding: 0 4px;
}
.column img {
  margin-top: 8px;
  vertical-align: middle;
}
/* Style the buttons */
.btn {
  border: none;
  outline: none;
  padding: 10px 16px;
  background-color: #f1f1f1;
  cursor: pointer;
  font-size: 18px;
}
.btn:hover {
  background-color: #ddd;
}
.btn.active {
  background-color: #666;
  color: white;
}
</style>
</head>
<body>

<div class="header" id="myHeader">
  <h1>Image Grid</h1>
  <p>Click on the buttons to change the grid view.</p>
  <button class="btn" onclick="one()">1</button>
  <button class="btn active" onclick="two()">2</button>
  <button class="btn" onclick="four()">4</button>
</div>

<div class="row"> 
  <div class="column">
    <img src="../w3images/wedding.jpg" style="width:100%">
    <img src="../w3images/rocks.jpg" style="width:100%">
    <img src="../w3images/falls2.jpg" style="width:100%">
    <img src="../w3images/paris.jpg" style="width:100%">
    <img src="../w3images/nature.jpg" style="width:100%">
    <img src="../w3images/mist.jpg" style="width:100%">
    <img src="../w3images/paris.jpg" style="width:100%">
  </div>
  <div class="column">
    <img src="../w3images/underwater.jpg" style="width:100%">
    <img src="../w3images/ocean.jpg" style="width:100%">
    <img src="../w3images/wedding.jpg" style="width:100%">
    <img src="../w3images/mountainskies.jpg" style="width:100%">
    <img src="../w3images/rocks.jpg" style="width:100%">
    <img src="../w3images/underwater.jpg" style="width:100%">
  </div>  
  <div class="column">
    <img src="../w3images/wedding.jpg" style="width:100%">
    <img src="../w3images/rocks.jpg" style="width:100%">
    <img src="../w3images/falls2.jpg" style="width:100%">
    <img src="../w3images/paris.jpg" style="width:100%">
    <img src="../w3images/nature.jpg" style="width:100%">
    <img src="../w3images/mist.jpg" style="width:100%">
    <img src="../w3images/paris.jpg" style="width:100%">
  </div>
  <div class="column">
    <img src="../w3images/underwater.jpg" style="width:100%">
    <img src="../w3images/ocean.jpg" style="width:100%">
    <img src="../w3images/wedding.jpg" style="width:100%">
    <img src="../w3images/mountainskies.jpg" style="width:100%">
    <img src="../w3images/rocks.jpg" style="width:100%">
    <img src="../w3images/underwater.jpg" style="width:100%">
  </div>
</div>
<script>
  // Get the elements with class="column"
  var elements = document.getElementsByClassName("column");
  // Declare a loop variable
  var i;
  // Full-width images
  function one() {
    for (i = 0; i < elements.length; i++) {
      elements[i].style.msFlex = "100%";  // IE10
      elements[i].style.flex = "100%";
    }
  }
  // Two images side by side
  function two() {
    for (i = 0; i < elements.length; i++) {
      elements[i].style.msFlex = "50%";  // IE10
      elements[i].style.flex = "50%";
    }
  }
  // Four images side by side
  function four() {
    for (i = 0; i < elements.length; i++) {
      elements[i].style.msFlex = "25%";  // IE10
      elements[i].style.flex = "25%";
    }
  }
  // Add active class to the current button (highlight it)
  var header = document.getElementById("myHeader");
  var btns = header.getElementsByClassName("btn");
  for (var i = 0; i < btns.length; i++) {
    btns[i].addEventListener("click", function () {
      var current = document.getElementsByClassName("active");
      current[0].className = current[0].className.replace(" active", "");
      this.className += " active";
    });
  }
</script>
</body>

</html>