video{  
          /*  position: fixed;  */
            right: 0px;  
            bottom: 0px;  
            min-width: 100%;  
            min-height: 100%;  
            height: auto;  
            width: auto;  
            /*加滤镜*/
            /*filter: blur(15px); //背景模糊设置 */
            /*-webkit-filter: grayscale(100%);*/  
            /*filter:grayscale(100%); //背景灰度设置*/  
            z-index:-11
        }  
        source{  
            min-width: 100%;  
            min-height: 100%;  
            height: auto;  
            width: auto;  
        }