Responsive Web Design

Responsive Web Design with Bootstrap: Build Mobile-Friendly Sites

Bootstrap is the most popular CSS framework for developing responsive, mobile-first websites. Let's explore how to use it.

1. Setting Up Bootstrap

Add Bootstrap to your project by including these in your HTML head:

<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">

<!-- Bootstrap JS Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>

2. Bootstrap Grid System

The grid system allows you to create responsive layouts with rows and columns:

<div class="container">
  <div class="row">
    <div class="col-sm-12 col-md-6 col-lg-4">
      Column 1
    </div>
    <div class="col-sm-12 col-md-6 col-lg-4">
      Column 2
    </div>
    <div class="col-sm-12 col-md-12 col-lg-4">
      Column 3
    </div>
  </div>
</div>

3. Useful Bootstrap Components

Navigation Bar

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">My Site</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav">
        <li class="nav-item">
          <a class="nav-link active" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">About</a>
        </li>
      </ul>
    </div>
  </div>
</nav>

Cards

<div class="card" style="width: 18rem;">
  <img src="..." class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Card title</h5>
    <p class="card-text">Some quick example text.</p>
    <a href="#" class="btn btn-primary">Go somewhere</a>
  </div>
</div>

Bootstrap makes responsive design easy with its pre-built components and utilities. Start using it in your projects today!