<style>
  .box {
    width: 200px;
    padding: 20px;
    border: 5px solid blue;
    margin: 15px;
    background-color: lightgrey;
  }
</style>

<div class="box">
  <p>This is a box with padding, border, and margin.</p>
</div>

<style>
  .container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 300px;
    background-color: lightblue;
  }
</style>

<div class="container">
  <p>I'm perfectly centered!</p>
</div>

<style>
  .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 100px 100px;
    gap: 10px;
  }

  .box {
    background-color: lightblue;
    padding: 20px;
    text-align: center;
  }
</style>

<div class="container">
  <div class="box">Box 1</div>
  <div class="box">Box 2</div>
  <div class="box">Box 3</div>
  <div class="box">Box 4</div>
</div>

<style>
  .button {
    background-color: lightblue;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s, transform 0.3s;
  }

  .button:hover {
    background-color: lightcoral;
    transform: scale(1.2);
  }
</style>

<button class="button">Hover me!</button>