body {
  text-align: center;
  color: #4d4d4d;
}

footer {
  margin: 1em;
}

.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 5px 5px;
  justify-items: center;
  align-items: center;
}

.item {
  padding: 1em;
  width: 300px;
  height: 210px;
  border-style: dotted;
}

img.opacity {
  opacity: 0.7;
  filter: alpha(opacity=70);
  /* border: 1px solid #4d4d4d; */
}

img.opacity:hover {
  opacity: 1;
  filter: alpha(opacity=100);
  /* border: 1px solid #000000; */
}