<div class="radikalwp-fm-suffix"><input type="text" value="۲۵۰٬۰۰۰" /><span>تومان<//span><//div>

.radikalwp-fm-suffix {
  display: flex;
  align-items: stretch;
  width: 240px;
  background: #fff;
  border: 1.5px solid #e2e8f0;
  border-radius: 12px;
  overflow: hidden;
  transition: border-color .25s ease;
}
.radikalwp-fm-suffix input {
  flex: 1;
  min-width: 0;
  padding: 12px 14px;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  color: #0f172a;
}
.radikalwp-fm-suffix span {
  display: flex;
  align-items: center;
  padding: 0 14px;
  font-size: 12px;
  font-weight: 700;
  color: #64748b;
  background: #f1f5f9;
  border-right: 1.5px solid #e2e8f0;
}
.radikalwp-fm-suffix:focus-within { border-color: #4f46e5; }