* {
	margin: 0;
	padding: 0;
	list-style: none;
	text-decoration: none;
}
.clearfix, .c {
	zoom: 1;
	clear: both;
}
.clearfix:after, .clearfix:before, .c:after, .c:before {
	display: table;
	content: "";
}
.clearfix:after, .c:after {
	clear: both;
}
/* Write your styles */
.l {
	float: left;
}
.r {
	float: right;
}
.box3 {
width: 1453px;
    padding: 10px;       /* 内边距不影响总宽度 */
    box-sizing: border-box; /* 确保padding不增加总宽度 */
}
.box {
width: 1200px;
 margin: auto;
}