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我在學習CSS，這是我迄今爲止編寫的代碼。我使用標籤更改段落的背景顏色，出於某種原因，當我進入Firefox的網頁時段落的背景不會改變。奇怪的是，當我將它粘貼到「snippet」中時，它在StackOverFlow上運行良好。更改div標籤中的背景顏色不起作用？
<!DOCTYPE HTML>
<html>
<style>
\t * {
\t \t font-family: georgia;
\t line-height: 1.3em;
\t \t background-color: #F3F4E4;
\t \t color: black;
\t \t }
\t \t p {
\t \t font-size: 17px;
font-style: italic;
\t \t }
\t \t #img1 {
\t \t width: 750px;
\t \t
\t \t }
\t \t
\t \t #img2 {
\t \t width: 600px;
\t \t }
\t \t
\t \t #list {
\t \t font-size: 25px;
\t \t }
\t \t #list-item, #lala {
font-family: SignPainter;
\t \t font-size: 22px; \t \t
\t \t }
\t \t h2 {
\t \t font-family: SignPainter;
font-size: 40px;
\t \t }
\t \t #critics {
\t \t width: 80%;
\t \t background-color: red;
\t \t }
\t </style>
<head>
<title>B to the F</title>
<p id="list">List</p>
\t <ul id="list-item">
\t <li><a href="#about">About</a></li>
\t \t <li><a href="#review">Critics</a></li>
\t </ul>
</head>
<body>
<center><h2>Back to the Future</h2></center>
\t <center><img src="http://images5.fanpop.com/image/photos/26500000/Back-To-The-Future-Trilogy-back-to-the-future-26581615-1014-574.jpg" alt="Back to the Future Trilogy" id="img1"></center>
\t \t <h3 id="about">About (Taken from Wikipedia Page)</h3>
\t \t <center><img src="http://apartment3k.com/wp-content/uploads/2015/10/doc-marty.jpg" alt="Doc and Marty" id="img2"></center>
\t <div id="critics">
<p>
\t \t The <span id="lala">Back to the Future</span> franchise is an American science fiction-adventure film series written and directed by Robert Zemeckis, produced by Bob Gale and Neil Canton for Steven Spielberg's Amblin Entertainment, and distributed by Universal Pictures. The franchise follows the adventures of a high school student, Marty McFly (Michael J. Fox), and an eccentric scientist, Dr. Emmett L. Brown (Christopher Lloyd), as they use a DeLorean time machine to time travel to different periods in the history of Hill Valley, California.<br>
The first film was the highest-grossing film of 1985 and became an international phenomenon, leading to the second and third films, which were back-to-back film productions, released in 1989 and 1990, respectively. Though the sequels did not perform quite as well at the box office as the first film, the trilogy remains immensely popular after a quarter-century and has yielded such spinoffs as an animated television series and a motion-simulation ride at the Universal Studios Theme Parks in Universal City, California; Orlando, Florida (now closed); and Osaka, Japan, as well as a Microsoft Windows, Macintosh, iPad, PS3, and Wii video game. The film's visual effects were done by Industrial Light and Magic. The trilogy was nominated for five Academy Awards all together, winning one (Best Sound Editing).
\t \t </p>
\t </div>
\t \t <h3 id="review">Is it any good?</h3>
\t \t <h4>Part I</h4>
\t \t <a href="http://www.rogerebert.com/reviews/back-to-the-future-1985">Roger Ebert</a><br>
\t \t <a href="http://www.imdb.com/title/tt0088763/">IMDb</a><br>
\t \t <a href="http://www.rottentomatoes.com/m/back_to_the_future">Rotten Tomatoes</a><br>
\t \t <h4>Part II</h4>
\t \t <a href="http://www.rogerebert.com/reviews/back-to-the-future-part-ii-1989">Roger Ebert</a><br>
\t \t <a href="http://www.imdb.com/title/tt0096874/">IMDb</a><br>
\t \t <a href="http://www.rottentomatoes.com/m/back_to_the_future_2/">Rotten Tomatoes</a><br>
\t \t <h4>Part III</h4>
\t \t <a href="http://www.rogerebert.com/reviews/back-to-the-future-part-iii-1990">Roger Ebert</a><br>
\t \t <a href="http://www.imdb.com/title/tt0099088">IMDb</a><br>
\t \t <a href="http://www.rottentomatoes.com/m/back_to_the_future_3/">Rotten Tomatoes</a><br>
</body>
</html>
謝謝你試試吧！但似乎問題不是固定的:(。我認爲這只是我的瀏覽器再次演出。 – Tikhung
你使用的是什麼版本的Firefox？如果3X嘗試升級到4X，確定 –