.dm_button {
  position: absolute;
  z-index: 1;
  background: white;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M383 233c-3-5-9-9-15-9h-64V16c0-9-7-16-16-16h-64c-9 0-16 7-16 16v208h-64a16 16 0 00-12 27l112 128a16 16 0 0024 0l112-128c4-5 5-12 3-18z'/%3E%3Cpath d='M432 352v96H80v-96H16v128c0 18 14 32 32 32h416c18 0 32-14 32-32V352h-64z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: 20px;
  background-position: center;
  width: 30px;
  height: 30px;
  top: 10px;
  right: 10px;
  opacity: 0;
}
.attachments li:hover .dm_button {
  opacity: 1;
}