<div class="radikalwp-fm-search"><span>⌕<//span><input type="search" placeholder="جستجو کنید..." /><//div>

.radikalwp-fm-search {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 260px;
  padding: 10px 16px;
  background: #f8fafc;
  border: 1.5px solid #e2e8f0;
  border-radius: 999px;
  transition: border-color .25s ease, box-shadow .25s ease, width .3s ease;
}
.radikalwp-fm-search span { color: #94a3b8; font-size: 16px; }
.radikalwp-fm-search input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  font-size: 13.5px;
  color: #0f172a;
}
.radikalwp-fm-search:focus-within {
  border-color: #a5b4fc;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, .12);
  width: 290px;
}