.@{input-tag-prefix-cls} { 
  &-wrapper .arco-input-tag-addbefore, 
  &-wrapper .arco-input-tag-addafter{
    border: 0;
  }
  &-wrapper .arco-input-tag:not(.arco-input-tag-focused):not(:first-child),
  &-wrapper .arco-input-tag:not(.arco-input-tag-focused):not(:last-child){
    border-radius: 4px;
  }
}