<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.4.1/dist/css/bootstrap.min.css"
    integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
  </head>
  <body>
    
    <div class="container mt-3">
      <div class="row">
        <div class="col-md-3 col-sm-6">
          <div class="box"></div>
        </div>
        <div class="col-md-3 col-sm-6">
          <div class="box"></div>
        </div>
        <div class="col-md-3 col-sm-6">
          <div class="box"></div>
        </div>
        <div class="col-md-3 col-sm-6">
          <div class="box"></div>
        </div>
      </div>
    </div>
    
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.4.1/dist/jquery.slim.min.js"
    integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n"
    crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"
    integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo"
    crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.4.1/dist/js/bootstrap.min.js"
    integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6"
    crossorigin="anonymous"></script>
  </body>
</html>
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.box {
  height: 100px;
  background-color: #badc58;
  border: 3px solid #f0932b;
}
"use strict"

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.