.about{
    position: relative;
    background-image: url("../../images/about/5.jpg");
    background-origin: border-box;
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    z-index: 1;
}
.about::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: -1;
}