<a> tag

Question

please help me. I can't understand why my css code for background image doesn't work.

.fb {
    margin-bottom: 10px;
    width: 160px;
    height:160px;
    display:block;
    background:transparent url('/images/social%20icons/normal/fb.png') center top no-repeat;
}

.fb:hover {
    background-image: url('/images/social%20icons/hover/fb.png');
}

<a href="#" class="fb"></a>

的背景图片

Answer 1

这有效：../images/social%20icons/normal/fb.png