<form class="radikalwp-form-search" action="#"><input class="radikalwp-form-search-input" type="search" placeholder="جستجوی اسنیپت، قالب یا مقاله..." aria-label="جستجو"><button class="radikalwp-form-search-btn" type="submit">🔍<//button><//form>

.radikalwp-form-search {
  display: flex;
  align-items: center;
  max-width: 420px;
  padding: 4px 4px 4px 0;
  background: #fff;
  border: 1.5px solid #e2e8f0;
  border-radius: 14px;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.radikalwp-form-search:focus-within {
  border-color: #6366f1;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, .15);
}
.radikalwp-form-search-input {
  flex: 1;
  padding: 11px 16px;
  font-family: inherit;
  font-size: 14px;
  color: #1e293b;
  background: transparent;
  border: none;
  outline: none;
}
.radikalwp-form-search-input::placeholder { color: #94a3b8; }
.radikalwp-form-search-btn {
  padding: 9px 16px;
  font-size: 15px;
  background: #eef2ff;
  border: none;
  border-radius: 11px;
  cursor: pointer;
  transition: background .25s ease;
}
.radikalwp-form-search-btn:hover { background: #e0e7ff; }