message: Make action button round in Safari. Fixes
diff: top: 0;
  right: 0;
  padding: 6px;
  + height: 14px; // needed for Safari
  z-index: 1000;
  background: white;
  box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
  transition: opacity 0.4s ease-in;
  outline: none;
  cursor: pointer;
  +
  &::-webkit-details-marker {
  display: none;
  }
  