設置了背景圖片以后，再加背景顏色加不上是怎么回事呀？
background: url(http://img1.sycdn.imooc.com//54cf2365000140e600740095.jpg) no-repeat left top/50px,
??????????????? url(http://img1.sycdn.imooc.com//54cf238a0001728d00740095.jpg) no-repeat center top/60px,
??????????????? url(http://img1.sycdn.imooc.com//54cf23b60001fd9700740096.jpg) no-repeat right top/70px;
??? margin:0 0 20px 0;
2015-08-07
? background-position: left top, 80px 0, 160px 0;
??? background-repeat: no-repeat, no-repeat, no-repeat;
??? background-color:red;
??? margin:0 0 20px 0;????并不是的?寫在哪都可以?大概是你瀏覽器問題?我用的是FF
2015-06-17
經過多次嘗試，得出結論：將顏色red寫在代碼最后一個url前邊或者代碼最后（也就是分號前邊）都是可以的。