body{
    position: relative;
}
.linhas{
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height:100%;
    display: flex;
    align-items: center;
    justify-content:space-around;
    z-index: -1;
}

.linha{

    width: 2px;
    height: 100%;
    background-color: #f1f1f1;
}