.rc-textarea-affix-wrapper {
  display: inline-block;
  box-sizing: border-box;
}
.rc-textarea-affix-wrapper textarea {
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 1px solid #1677ff;
}
.rc-textarea-out-of-range,
.rc-textarea-out-of-range textarea {
  color: red;
}