#imgmax{
    width: 100%;
    height: 100%;
    background: violet;
}
.newimg{
    width:80%;
    position:absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    position:fixed !important; /* 浮动对话框 */ 
    z-index: 4;
}
.newspanzuo{
    position:absolute;
    width:50px;
    left:6px;
    top:45%;
    position:fixed !important; /* 浮动对话框 */ 
    z-index: 4;
}

.newspanyou{
    position:absolute;
    width:50px;
    right:6px;
    top:45%;
    position:fixed !important; /* 浮动对话框 */ 
    z-index: 4;
}