.m-activity .item {
            float:left;
            min-width: 100%;
            height:33.3%;}

            .m-activity .item .pic-btn {
                display: none;
                position: relative;
                z-index: 999;}

            .m-activity .item.big .pic-btn {
                width: 100%;
                height: 100%;
                background-color: rgba(0, 0, 0, 0.8);
                display: block;}

            .m-activity .item.big .pic-btn .pic01 img {
                width: 20%;
                height:20%;}

            .m-activity .item.big .pic-btn .pic02 img {
                width: 20%;
                height:20%;}

            .m-activity .item.big .pic-btn .pic01 {
                position: relative;
                width: 20%;
                left: 25%;
                top: 50%;
                z-index: 999;}

            .m-activity .item.big .pic-btn .pic02 {
                position:  relative;
                width: 20%;
                right: 25%;
                top: 50%;
                z-index: 999;}
            
            
            
            .m-activity-m .item {
            float:left;
            min-width: 100%;
            height:33.3%;}
            
            .m-activity-m .item .pic-btn {
                display: none;
                position: relative;
                z-index: 999;}
            
            .m-activity-m .item.big .pic-btn {
                width: 100%;
                height: 100%;
                background-color: rgba(0, 0, 0, 0.8);
                display: block;}
            
            .m-activity-m .item.big .pic-btn .pic01 img {
                width: 100%;
                height: 100%;}
            
            .m-activity-m .item.big .pic-btn .pic02 img {
                width:20%;
                height: 20%;}
            
            .m-activity-m .item.big .pic-btn .pic01 {
                position: relative;
                width: 38%;
                left: 10%;
                top: 42%;
                z-index: 999;}
            
            .m-activity-m .item.big .pic-btn .pic02 {
                position: relative;
                width: 38%;
                right: 10%;
                top: 42%;
                z-index: 999;}