/*伸缩布局*/
.flex{
	display: flex;
}
.flex-sp{
	flex-direction: column;
}
.flex-center{
	justify-content: center;
}
.space-between{
	justify-content: space-between;
}
.space-around{
	justify-content: space-around;
}
.flex-ac{
	align-items: center;
}
.flex-wrap{
	flex-wrap: wrap;
}