web/src/pages/flow/message-form/index.less

.dynamicDeleteButton {
  position: relative;
  top: 4px;
  margin: 0 8px;
  color: #999;
  font-size: 24px;
  cursor: pointer;
  transition: all 0.3s;
  &:hover {
    color: #777;
  }
  &[disabled] {
    cursor: not-allowed;
    opacity: 0.5;
  }
}