html,body{
	margin:0;
	padding: 0;
	height: 100%;
	width: 100%;
	overflow-x: hidden;
	/* font-family:"宋体"; */
}
.flex-center{
	display: flex;
	align-items: center;
}
.flex-center-center{
	display: flex;
	align-items: center;
	justify-content: center;
}
.flex-flex-start-center{
	display: flex;
	align-items: flex-start;
	justify-content: center;
}
.flex-start-start{
	display: flex;
	align-items: flex-start;
	justify-content: flex-start;
}
.flex-center-start{
	display: flex;
	align-items: center;
	justify-content: flex-start;
}
.flex-center-end{
	display: flex;
	align-items: center;
	justify-content: flex-end;
}
.flex-center-space-between{
    display: flex;
	align-items: center;
	justify-content: space-between;
}
.flex-center-justify{
    display: flex;
	justify-content: center;
}
.flex-center-space-around{
    display: flex;
	align-items: center;
	justify-content:space-around;
}
.flex-space-between{
	display: flex;
	justify-content: space-between;
}
.flex-column-center{
	display: flex;
	flex-direction: column;
	justify-content: center;
}
.flex-column-center-center{
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}
.flex-column{
	display: flex;
	flex-direction: column;
}
.flex-column-start{
	display: flex;
	flex-direction: column;
	justify-content: flex-start;
}
.flex-column-space-between{
	display: flex;
	flex-direction: column;
	justify-content: space-between;
}
.margin-bottom{
	margin-bottom: 20px;
}
.margin-top{
	margin-top: 20px;
}
.margin-bottom-10{
	margin-bottom: 10px;
}
.margin-top-10{
	margin-top: 10px;
}