<p>
    <label>username</label>
    <input type='text' name='username' size='30' />
</p>
<p>
    <label>password</label>
    <input type='password' name='password' size='30' />
</p>

form input[type=text] {
    background: url(/images/user.png) no-repeat
}
form input[type=password] {
    background: url(/images/key.png) no-repeat
}

form input {
    text-indent: 1.2em;
}

<form method='post' action='#'>
  <p>
    <label>name</label>
    <input type='text' name='name' size='30' />
  </p>
</form>

form textarea,
form input {
    border:1px solid #C3A6E1;
    color:#333;
    padding:.3em;
    -moz-border-radius:3px;
    -webkit-border-radius:3px;
}

form textarea,
form input {
    -webkit-border-radius:3px
}

form textarea:focus,
form input:focus {
    border:1px solid #96C;
    -moz-box-shadow:0 0 4px #E6D9F2; 
    -webkit-box-shadow:0 0 4px #E6D9F2; 
}