div.group, span.group {
  user-select: none;

  & > button:not(:first-child) {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
  }

  & > button:not(:last-child) {
    border-right: 0;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
  }  
}
