<form class="csb-neon" role="search">
  <label class="csb-sr" for="csb-neon-i">Search</label>
  <input id="csb-neon-i" type="search" name="q" placeholder="$ search_" />
</form>

.csb-neon {
  position: relative; display: inline-block;
}
.csb-neon input {
  width: 260px;
  padding: 12px 16px;
  background: #0a0014;
  border: 1.5px solid #6cffff;
  border-radius: 4px;
  color: #6cffff;
  font: 500 13px/1 'Courier New', monospace;
  letter-spacing: 0.06em;
  outline: none;
  box-shadow: 0 0 8px rgba(108,255,255,0.25), inset 0 0 6px rgba(108,255,255,0.1);
  transition: box-shadow 0.25s, border-color 0.25s;
}
.csb-neon input::placeholder { color: rgba(108,255,255,0.5); }
.csb-neon input:focus {
  border-color: #ff6cff;
  box-shadow: 0 0 18px rgba(255,108,255,0.6), 0 0 36px rgba(255,108,255,0.2), inset 0 0 10px rgba(255,108,255,0.15);
  color: #ff6cff;
}

.csb-sr {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}