.section-full_width_image_text_header {
    height: 420px;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: top;
    display: flex;
    align-items: flex-end;
    position: relative;
}
.section-full_width_image_text_header:before {
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background: rgba(0,0,0,0.2);
}