Text and border without opacity and background with opacity. How to do this efficiently? [duplicate]

This question already has an answer here:

• How do I give text or an image a transparent background using CSS? 23 answers

I managed to do this, but its really complicated, and you cant resize your browser widnow becaouse everything is getting messy.

Thats how it looks(but only in full screen 1920x1080):

And thats my over complicated way to do this:

HTML:

<div class="head">
    <img src="panoramic.jpg">
    <div class="jatax">
        <div class="relative">
            <span> ABCDJ </span> 
            <div class="opacity"></div>
        </div>
    </div>
</div>

CSS:

img {
    width:100%
}

div.jatax {
    position: absolute;
    top: 30%;
    left: 30%;
    font-size: 200px;
    color: #353535;

}

div.head {
    position: relative;
}

div.opacity { 
    position: absolute;
    opacity: 0.5;
    background-color: white;
    z-index: 1;
    overflow: auto;
    padding: 35px;
    top: 0;
    left: 0;
    width: 635px;
    height: 220px;
    z-index: 1;
}

div.relative {
    position: relative;
    border: 5px solid white;
    width: 705px;
    height: 290px;
}

div.relative span {
    display: block;
    height: 220px;
    width: 635px;
    padding: 40px;
    position: absolute;
    z-index: 2;
}

The question is: How to do this in a simple way ?

Here it's just one picture so i could use photoshop, and then just use this modified img, BUT actually i want to use slide show instead of single img.