<div class="cp_iptxt">
	<input type="text" placeholder="お名前">
	<i class="fa fa-user fa-lg fa-fw" aria-hidden="true"></i>
</div>

.cp_iptxt {
	position: relative;
	width: 80%;
	margin: 40px 3%;
}
.cp_iptxt input[type=text] {
	font: 15px/24px sans-serif;
	box-sizing: border-box;
	width: 100%;
	margin: 8px 0;
	padding: 0.3em;
	transition: 0.3s;
	border: 1px solid #1b2538;
	border-radius: 4px;
	outline: none;
}
.cp_iptxt input[type=text]:focus {
	border-color: #da3c41;
}
.cp_iptxt input[type=text] {
	padding-left: 40px;
}
.cp_iptxt i {
	position: absolute;
	top: 8px;
	left: 0;
	padding: 9px 8px;
	transition: 0.3s;
	color: #aaaaaa;
}
.cp_iptxt input[type=text]:focus + i {
	color: #da3c41;
}