.ball {
	position: relative;
	width: 70px;
	height: 70px;
	border-radius: 50%;
	display: inline-block;
	background-color: #fff;
	background-size: cover;
	background-position: center;
	text-align: center;
}
.ball img {
	width: 100%;
	height: auto;
	border-radius: 50%;
	display: block;
}
.ball, .plus-sign {
	display: inline-block;
	vertical-align: middle;
	text-align: center;
}
.plus-sign {
	width: 40px;
	height: 40px;
	line-height: 40px;
	font-size: 20px;
}
.ball span {
	position: absolute;
	left: 50%;
	top: 50%;
	transform: translate(-50%, -50%);
	font-size: 30px;
	display: flex;
	align-items: center;
	justify-content: center;
}
.ball.hongbo {
	background-image: url('picture/red-color.png');
}
.ball.lanbo {
	background-image: url('picture/green-color.png');
}
.ball.lvbo {
	background-image: url('picture/blue-color.png');
}
.ball .info {
	position: absolute;
	bottom: -20px;
	left: 50%;
	transform: translateX(-50%);
	font-size: 14px;
	white-space: nowrap; 
}
@media (max-width: 600px) {
	.ball {
		width: 32px; 
		height: 32px;
		margin: 1px;
	}
	.ball span {
		font-size: 16px;
	}
	.ball, .plus-sign {
		display: inline-block;
		vertical-align: middle;
		text-align: center; 
	}
	.plus-sign {
		width: 38px;
		height: 38px;
		line-height: 80px;
	}
}