perkeep/server/camlistored/ui/blob_item_container.css

.cam-blobitemcontainer {
  outline: 0;  /* Do not show an outline when container has focus. */
  border-width: 5px;
  border-color: rgba(0, 0, 0, 0);
  border-style: dashed;
  position: relative;
  border-radius: 5px;
}
.cam-blobitemcontainer-dropactive {
  border-color: #acf;
}
.cam-blobitemcontainer-drag-indicator {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  display: none;
}
.cam-blobitemcontainer-dropactive .cam-blobitemcontainer-drag-indicator {
  display: block;
}
.cam-blobitemcontainer-drag-message {
  display: block;
  margin: 0 auto;
  border: 10px solid #acf;
  padding: 25px;
  background-color: #def;
  color: #000;
  font-size: 16px;
  font-family: sans-serif;
  width: 250px;
  opacity: 0.8;
  text-align: center;
  border-radius: 10px;
  margin-top: 30px;
}

.cam-blobitemcontainer-hidden {
  display: none;
}