<body>
<form class="search" action="" method="post">
    <label for="search-box">Search:</label>
    <input id="search-box" type="text" name="search" maxlength="50">
</form>
</body>
body{
  background-color: #876;
}
.search label{
    font-size: 0.75em;
    font-weight: bold;
    color: #333;
    text-indent: -9999em;
    display: block;
    float: left;
}
.search input[type="text"]{
    text-indent: 1px;
    padding: 3px 0 3px 22px;
    width: 5px;
    height: 22px;
    background-color: #333;
    background: url(http://www.ian-thomas.net/examples/search-icon.png)2px 2px no-repeat, -webkit-linear-gradient(top, rgba(100,100,100,1) 0%,rgba(80,80,80,1) 10%,rgba(22,22,22,1)100%);
    color:#999;
    line-height: 20px;
    font-weight: bold;
    -webkit-text-shadow: 1px 1px 1pxrgba(0,0,0,0.05);
    text-shadow: 1px 1px 1pxrgba(0,0,0,0.05);
    -webkit-border-radius: 6px;
    -webkit-box-shadow: 1px 1px 0rgba(0,0,0,0.125);
    -webkit-transition: width 0.5s ease-in-out;
    -moz-transition: width 0.5s ease-in-out;
    transition: width 0.5s ease-in-out;
    cursor: pointer;
}
.search input[type="text"]:focus{
    width: 250px;
    outline: none;
    background:url(http://www.ian-thomas.net/examples/search-icon.png)2px 2px no-repeat, -webkit-linear-gradient(bottom,rgba(100,100,100,1) 0%, rgba(40,40,40,1) 2%, rgba(22,22,22,1)100%);
    -webkit-box-shadow:1px 1px 0 rgba(255,255,255,0.125);
    -webkit-transition: width 0.5s ease-in-out;
    -moz-transition: width 0.5s ease-in-out;
    transition: width 0.5s ease-in-out;
    cursor:text;
}

External CSS

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External JavaScript

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