.nassjo-hero-image {
    position: relative;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

.nassjo-hero-image-textwrapper {
    position: absolute;
    width: 100%;
    text-align: center;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
        -ms-transform: translate(-50%, -50%);
            transform: translate(-50%, -50%);          
}