.bis {
	background-repeat: no-repeat;
	background-size: 100% 100%;
}

//flex 布局和 子元素 对其方式
.fl {
	display: flex;
}

.fj {
	display: flex;
	justify-content: space-between;
}

.fje {
	display: flex;
	justify-content: flex-end;
}

//水平和垂直居中
.fcc {
	display: flex;
	justify-content: center;
	align-items: center;
}

// 为元素设定的宽度和高度决定了元素的边框盒。
.bb {
	box-sizing: border-box;
}

// 满屏
.fullp {
	width: 100%;
	height: 100%;
}

.shadow {
	box-shadow: 0 6px 18px 0 rgba(0, 0, 0, 0.10);
	border-radius: 8px;
}

.linear {
	background-image: linear-gradient(to right, #1bade8, #3680EB);
}