被调整大小的 background-image:
Shanghai is one of the four direct-administered municipalities of the People's Republic of China. Welcome to Shanghai!
The city is located on the southern estuary of the Yangtze, with the Huangpu River flowing through it.
background-image 的原始尺寸：
Shanghai is one of the four direct-administered municipalities of the People's Republic of China. Welcome to Shanghai!
The city is located on the southern estuary of the Yangtze, with the Huangpu River flowing through it.