回復討論(解決方案)

background-image: url(http://images.mafengwo.net/images/signup/mbg2.jpg);
}
background-position: 50% 50%;
background-size: cover;
bottom: 0;
right: 0;
position: fixed;
position: absolute\9;
width: 100%\9;
height: 100%\9;
overflow: hidden;
left: 0;
top: 0;

background-image: url(http://images.mafengwo.net/images/signup/mbg2.jpg);
}
background-position: 50% 50%;
background-size: cover;
bottom: 0;
right: 0;
position: fixed;
position: absolute\9;
width: 100%\9;
height: 100%\9;
overflow: hidden;
left: 0;
top: 0;

你確定就這樣了？

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