.border{
　　position: relative;
}

.borders::before{
    position: absolute;
    left: 0;
    top: 0;
    content: " ";
    width: 100%;
    height: 0;
    border-top: 1px solid #e5e5e5;
    transform-origin: 0 0;
    transform: scaleY(0.5);/*缩放*/
}