Input personalizado - Voltar

form .area{
	margin: 10px 0;
}
.area .title{
    font-size: 18px;
	color: #373737;
}
.area .campo{
	margin-top: 5px;
	height: 50px;
	width: 100%;
	position: relative;
}
.area .campo input{
	height: 100%;
	width: 100%;
	border: none;
	outline: none;
	padding: 0 15px;
	font-size: 15px;
	background: #F1F1F7;
	border-bottom: 2px solid #ccc;
	font-family: 'Noto Sans', sans-serif;
}
.area .campo input::placeholder{
	color: #b3b3b3;
}
.area .campo .linha{
	position: absolute;
	left: 0;
	bottom: 0;
	height: 2px;
	width: 100%;
	background: #F00;
	transform: scale(0);
	transition: transform 0.3s ease;
}
.area .campo input:focus ~ .linha,
.area .campo input:valid ~ .linha{
	transform: scale(1);
}