[HTML]Transparent Input Box

<html>
<head>
<style>
.bg {
  background: url('https://images.unsplash.com/photo-1445127040028-b1bdb9acd16e?crop=entropy&fit=crop&fm=jpg&h=950&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=1125') center top no-repeat;
  display: block;
  background-size: cover;
  height: 768px;
  width: 100%;
  position: relative;
}
input {
  background: rgba(255,255,255,0.4);
  border: none;
  position: relative;
  display: block;
  outline: none;
  width: 400px;
  height: 30p;
  top: 250px;
  margin: 0 auto;
  padding: 10px;
  color: #333;
  -webkit-box-shadow: 0 2px 10px 1px rgba(0,0,0,0.5);
  box-shadow: 0 2px 10px 1px rgba(0,0,0,0.5);
}
::-webkit-input-placeholder { color: #666;}
:-moz-placeholder { color: #666; }
::-moz-placeholder { color: #666; }
:-ms-input-placeholder { color: #666; }
</style>
<div class="bg">
  <input type="text" placeholder="BACOT MULU LO KONTOL"/>
</div>