Glazige, ondoorzichtige achtergrond van melkglas

.glas
  {
    position: relative;
    width: 100%;
    height: 450px;
    background-image: url(https://tory.eu/wp-content/uploads/2021/12/utrecht13.jpg);
    background-size: cover;
  }

.glas div
  {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 1.2em;
    font-size: 1.2em;
  }

.glas1 div
  {
    -webkit-backdrop-filter: blur(8px);  /* Safari 9+ */
    backdrop-filter: blur(8px); /* Chrome and Opera */
    box-shadow: inset 0 0 0 200px rgba(255,255,255,0.08);
  }

.glas2 div
  {
    -webkit-backdrop-filter: blur(8px);  /* Safari 9+ */
    backdrop-filter: blur(8px); /* Chrome and Opera */
    box-shadow: 0px 10px 15px 10px rgb(0 0 0 / 15%);
    background-color: rgb(228 228 228 / 15%); 
  }

.glas3 div
  {
    filter: drop-shadow(2px 4px 6px black);
    background-color: rgb(152 151 151 / 25%); /* Just adjust the color or opacity to make the text pop! */
    box-shadow: inset 0 0 0 200px rgb(255 255 255 / 8%);
  }

.glas4 div
  {
    backdrop-filter: grayscale(.8) blur(5px);
    box-shadow: inset 0 0 0 200px rgba(255,255,255,0.08);
    border-top: 2px solid rgba(225, 225, 225, 0.3);
    border-left: 2px solid rgba(225, 225, 225, 0.1);
    border-right: 1px solid rgba(225, 225, 225, 0.2);
  }

echo "<div class='glas glas1'>";
echo "<div>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quam dolores quod debitis veritatis placeat nemo iste natus maxime.</div>";
echo "</div>";

echo "<div class='glas glas2'>";
echo "<div>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quam dolores quod debitis veritatis placeat nemo iste natus maxime.</div>";
echo "</div>";

echo "<div class='glas glas3'>";
echo "<div>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quam dolores quod debitis veritatis placeat nemo iste natus maxime.</div>";
echo "</div>";

echo "<div class='glas glas4'>";
echo "<div>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quam dolores quod debitis veritatis placeat nemo iste natus maxime.</div>";
echo "</div>";