A Pen by Saminou yengue kizidi.

index.html

<div id="bg">
  <img src="http://img.skitch.com/20120905-fccfjyqxpxbkrhs6wct3xuyrjf.png" alt="">
</div>

<form>
  <div class="title">Login</div>
  <input type="text" placeholder="Username">
  <input type="password" placeholder="Password">
  <input type="submit" value="Get in there">
</form>

Simple-transparent-input-boxes.markdown

Simple transparent input boxes

Updated version thanks to input from these awesome folks: Druid of Lûhn - http://codepen.io/Druid-of-Luhn Hugo Giraudel - http://codepen.io/HugoGiraudel Kasper Mikiewicz - http://codepen.io/Idered

Fixed poor construction (using div's originally), and shitty centering techinque. Thank you @Druid of Lûhn for the superb example: http://codepen.io/Druid-of-Luhn/pen/jsytf

A Pen by Saminou yengue kizidi on CodePen.

License.

style.css

body {
  background: #bdbdc7;
  margin: 0 0;
  padding:10px;
  text-align:center;
}

#bg {
  position:fixed; 
  top:-50%; 
  left:-50%; 
  width:200%; 
  height:200%;
}

#bg img {
  position:absolute; 
  top:0; 
  left:0; 
  right:0; 
  bottom:0; 
	margin:auto; 
	min-width:50%;
	min-height:50%;
}

.title {
  position:relative;
	font-family: 'Myriad Pro','Helvetica Neue', Helvetica;
  font-weight:bold;
  font-size: 25px;
  text-shadow: 0px 1px 2px rgba(255,255,255,.5);
  color: #444;
  text-align:center;
}

form {
  background: none;
  margin: 20px auto 0;
  padding: 10px;
  width: 280px;
}

input {
  display: block;
  font-size: 14px;
  width:240px;
  margin: 10px auto;
  padding: 10px 8px 10px 8px;
  border-radius: 5px;
  box-shadow: inset 0 1px 2px rgba(0,0,0, .55), 0px 1px 1px rgba(255,255,255,.5);
  border: 1px solid #666;
}

input {
  opacity: 0.5;
}

input:hover,
input:focus {
  opacity: .7;
  color:#08c;
  border: 1px solid #08c;
   box-shadow: 0px 1px 0px rgba(255,255,255,.25),inset 0px 3px 6px rgba(0,0,0,.25);
}

input[type="text"]:focus,
input[type="password"]:focus {
  box-shadow: inset 0 1px 2px rgba(255,255,255, .35), 0px 1px 15px rgba(0,246,255,.5);
  border: 1px solid #08c;
  outline: none;
}

input[type="submit"] {
  appearance: none;
  opacity: .99;
  width:120px;
  background: #08c;
  box-shadow: inset 0 1px 2px rgba(255,255,255, .35), 0px 1px 6px rgba(0,246,255,.5);
  border: 1px solid #0a5378;
  border-radius: 4px;
  color: #eee;
  cursor: pointer;
  text-shadow:0px -1px 0px rgba(0,0,0,.5);
}

input[type="submit"]:hover {
  background: #08c;
  width:120px;
  border: 1px solid #0a5378;
  border-radius: 3px;
  box-shadow: inset 0px 3px 16px rgba(0,0,0,.25),0px 1px 10px rgba(255,255,255,.5),inset 0px -1px 2px rgba(255,255,255,.35);
  text-shadow:0px 1px 1px rgba(0,0,0,.65);
  -webkit-transition: all 0.40s ease-out;
  transition: all 0.40s ease-out;
}