.thumbnail {
    width: 200px;
    cursor: pointer;
}

#overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.8);

    /* Bild zentrieren */
    justify-content: center;
    align-items: center;

    z-index: 9999;
}

#overlay img {
    max-width: 90%;
    max-height: 90%;
    cursor: pointer;
    box-shadow: 0 0 20px black;
}
.two-columns {
  column-count: 2;
  column-gap: 40px;
}

.gallery {
  max-width: 600px;
}

#main-image {
  width: 100%;
  display: block;
  margin-bottom: 1rem;
}

.gallery-nav {
  display: flex;
  gap: 0.5rem;
}
.gallery-nav button {
    cursor: pointer;
    padding: 10px;
    margin-left: 3px;
    font-size:.7em
}


.gallery-nav button:hover {
  background: #999;
  color: white;
}