<div class="radikalwp-ui-inpsearch"><input type="search" placeholder="دنبال چه چیزی می‌گردید؟"><//div>

.radikalwp-ui-inpsearch {
  position: relative;
  width: 300px;
  font-family: inherit;
}
.radikalwp-ui-inpsearch input {
  width: 100%;
  padding: 12px 42px 12px 16px;
  font-family: inherit;
  font-size: 14px;
  color: #0f172a;
  background: #f8fafc;
  border: 1.5px solid #e2e8f0;
  border-radius: 999px;
  outline: none;
  transition: border-color .25s ease, background .25s ease, box-shadow .25s ease;
}
.radikalwp-ui-inpsearch input::placeholder { color: #94a3b8; }
.radikalwp-ui-inpsearch::before {
  content: '';
  position: absolute;
  top: 50%;
  right: 18px;
  width: 11px;
  height: 11px;
  border: 2px solid #94a3b8;
  border-radius: 50%;
  transform: translateY(-58%);
  transition: border-color .25s ease;
  pointer-events: none;
}
.radikalwp-ui-inpsearch::after {
  content: '';
  position: absolute;
  top: calc(50% + 5px);
  right: 14px;
  width: 8px;
  height: 2px;
  background: #94a3b8;
  border-radius: 2px;
  transform: rotate(45deg);
  transition: background .25s ease;
  pointer-events: none;
}
.radikalwp-ui-inpsearch:focus-within::before { border-color: #2563eb; }
.radikalwp-ui-inpsearch:focus-within::after { background: #2563eb; }
.radikalwp-ui-inpsearch input:focus {
  border-color: #93c5fd;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .12);
}