更改 CSS 中的背景颜色

  <link rel="stylesheet" type="text/css" href="styles.css"><div class="container">    <p id="paragraph">this is a paragraph.</p>    <button>click me</button>  </div>

/* Change background color of the body */body {  background-color: lightblue;}/* Change background color of an element with the class 'container' */.container {  background-color: lightgreen;}/* Change background color of an element with the id 'paragraph' */#paragraph {  background-color: lightyellow;}/* Change background color of all button elements */button {  background-color: lightcoral;}