Expanding Mobile Search fields

mobile-search-style.css

/* reset webkit search input browser style */
input {
	outline: none;
}
input[type=search] {
	-webkit-appearance: textfield;
	-webkit-box-sizing: content-box;
	font-family: inherit;
	font-size: 100%;
}
input::-webkit-search-decoration,
input::-webkit-search-cancel-button {
	display: none; /* remove the search and cancel icon */
}

/* search input field */
input[type=search] {
	background: #ededed url(images/search-icon.png) no-repeat 9px center;
	border: solid 1px #ccc;
	padding: 9px 10px 9px 32px;
	width: 55px;
	
	-webkit-border-radius: 10em;
	-moz-border-radius: 10em;
	border-radius: 10em;
	
	-webkit-transition: all .5s;
	-moz-transition: all .5s;
	transition: all .5s;
}
input[type=search]:focus {
	width: 130px;
	background-color: #fff;
	border-color: #6dcff6;
	
	-webkit-box-shadow: 0 0 5px rgba(109,207,246,.5);
	-moz-box-shadow: 0 0 5px rgba(109,207,246,.5);
	box-shadow: 0 0 5px rgba(109,207,246,.5);
}

/* placeholder */
input:-moz-placeholder {
	color: #999;
}
input::-webkit-input-placeholder {
	color: #999;
}

/* demo B */
#demo-b input[type=search] {
	width: 15px;
	padding-left: 10px;
	color: transparent;
	cursor: pointer;
}
#demo-b input[type=search]:hover {
	background-color: #fff;
}
#demo-b input[type=search]:focus {
	width: 130px;
	padding-left: 32px;
	color: #000;
	background-color: #fff;
	cursor: auto;
}
#demo-b input:-moz-placeholder {
	color: transparent;
}
#demo-b input::-webkit-input-placeholder {
	color: transparent;
}

mobile-search-style.html

<form>
	<input type="search" placeholder="Search">
</form>

<h3>Demo B</h3>
<form id="demo-b">
	<input type="search" placeholder="Search">
</form>