body{
     width：100%；
	height: 100%;
	background-image: url(https://th.bing.com/th/id/Rfe3f0e518f1080d559b2ecfc9b90ed53?rik=5VAy%2bWR1VIKTbA&riu=http%3a%2f%2fpicture.ik123.com%2fuploads%2fallimg%2f150207%2f17-15020G10U3.jpg&ehk=kKAP%2bGTLHjXX1Vz64DlkU%2f3nLLo%2boP8r69T28oJb7Og%3d&risl=&pid=ImgRaw);
	background-repeat: no-repeat;
	background-size: 100% 100%;
}