Colonne Cards responsive

https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_column_cards

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
}

/* Float four columns side by side */
.column {
  float: left;
  width: 25%;
  padding: 0 10px;
}

/* Remove extra left and right margins, due to padding */
.row {margin: 0 -5px;}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* Responsive columns */
@media screen and (max-width: 600px) {
  .column {
    width: 100%;
    display: block;
    margin-bottom: 20px;
  }
}

/* Style the counter cards */
.card {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  padding: 16px;
  text-align: center;
  background-color: #f1f1f1;
}
</style>
</head>
<body>

<h2>Responsive Column Cards</h2>
<p>Resize the browser window to see the effect.</p>

</body>
</html>

https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_column_cards

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {
box-sizing: border-box;
}

body {
font-family: Arial, Helvetica, sans-serif;
}

/* Float four columns side by side */
.column {
float: left;
width: 25%;
padding: 0 10px;
}

/* Remove extra left and right margins, due to padding */
.row {margin: 0 -5px;}

/* Clear floats after the columns */
.row:after {
content: "";
display: table;
clear: both;
}

/* Responsive columns */
@media screen and (max-width: 600px) {
.column {
width: 100%;
display: block;
margin-bottom: 20px;
}
}

/* Style the counter cards */
.card {
box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
padding: 16px;
text-align: center;
background-color: #f1f1f1;
}
</style>
</head>
<body>

<h2>Responsive Column Cards</h2>
<p>Resize the browser window to see the effect.</p>

<div class="row">
<div class="column">
<div class="card">
<h3>Card 1</h3>
<p>Some text</p>
<p>Some text</p>
</div>
</div>

<div class="column">
<div class="card">
<h3>Card 2</h3>
<p>Some text</p>
<p>Some text</p>
</div>
</div>

<div class="column">
<div class="card">
<h3>Card 3</h3>
<p>Some text</p>
<p>Some text</p>
</div>
</div>

<div class="column">
<div class="card">
<h3>Card 4</h3>
<p>Some text</p>
<p>Some text</p>
</div>
</div>
</div>

</body>
</html>