@CBroe评论是精确（您没有显示 a 内容）。然后，要查看图像，您需要将图像设置为＃link1 而不是＃link1 a 的背景：

The @CBroe comment is precise (you are not displaying the a content). Then, to see the image you need to set the image to background of #link1 and not #link1 a:

#link1 a {
    width: 113px;
    display: block;
}

#link1 {
    background: url('https://www.google.com/images/srpr/logo11w.png') no-repeat;
}