Revert "调整文字图片尺寸，不必依赖(0)Rset.css。"

This reverts commit 41a4a106b92ed80a1b41cff032b34bfc408ff672.
改成640宽的布局，所以视口÷2。

Signed-off-by: WseMad <mgtx460@163.com>