Horizontal centering text over image via CSS

Try the following CSS:

.image {
    position:relative;
}

.text {
    left: 0;
    position:absolute;
    text-align:center;
    top: 30px;
    width: 100%
}

Try this:

.image {
    position:relative;
}

.text {
    position: absolute;
    top: 0;
    left: 0;
    width:100%;    
    height:100%;
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
}