.drow {
  display: flex;
  flex-wrap: wrap;
  padding: 0 4px;
}

/* Create four equal columns that sits next to each other */
.dcolumn {
  flex: 25%;
  max-width: 25%;
  padding: 0 4px;
}

.dcolumn img {
  margin-top: 8px;
  vertical-align: middle;
  opacity: 0.5;
  filter: alpha(opacity=50); /* For IE8 and earlier */
}

.dcolumn img:hover {
    opacity: 1.0;
    filter: alpha(opacity=100); /* For IE8 and earlier */
}

.dcolumn a {
  border:0;
}

/* Responsive layout - makes a two column-layout instead of four columns */
@media (max-width: 800px) {
  .dcolumn {
    flex: 50%;
    max-width: 50%;
  }
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
@media (max-width: 600px) {
  .dcolumn {
    flex: 100%;
    max-width: 100%;
  }
}