body {
  background-color: #fff;
  margin: 0;
}

.show {
  border: solid 1px red;
}

#grid {
  display: block;
  /* width: 50%;
  margin: 0 auto 0 auto; */
  position: relative;
}

.thumb {
  position: relative;
  display: block;
  width: 40px;
  height: 30px;
  overflow: hidden;
  border: none;
  margin: 0;
  padding: 0;
  float: left;
  opacity: 1.0;

}

/* groot beeld */
.thumb:hover {

  opacity: 0.7;

}

.thumb img {
  width: 300px;
  position: absolute;
  display: block;
  margin: 0;
}