.main .calculator.flash-line .top{
    position: relative;
}

.main .calculator.flash-line .move{
    content: '';
    display: block;
    position: absolute;
    background: url(/document/calculate/flash/line-move.png) no-repeat center center;
    background-size:contain;		
    height: 100%;
    width: 100%;
    top: 0;
    left:0;		
    z-index:-1;
}