form-css.css

body {
	font-family: Arial, Helvetica, sans-serif;
	background-image: linear-gradient(to right, rgb(20, 147, 220), rgb(17, 54, 71));
}
	  
.box {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	background-color: rgba(0, 0, 0, 0.6);
	padding: 15px;
	border-radius: 15px;
	widht: 20%;
	color: white;
}
	
fieldset {
	border: 3px solid dodgerblue;
}

legend {
	border: 1px solid dodgerblue;
	padding: 10px;
	text-align: center;
	background-color: dodgerblue;
	border-radius: 8px;
}
	  
.inputbox {
	position: relative;
}
	  
.inputuser {
	background: none;
	border: none;
	border-bottom: 1px solid white;
	outline: none;
	color: white;
	font-size: 15px;
	width: 100%;
	letter-spacing: 2px;
}
	  
.inputlabel {
	position: absolute;
	top: 0px;
	left: 0px;
	pointer-events: none;
	transition: .5s;
}
	  
.inputuser:focus ~ .inputlabel,
.inputuser:valid ~ .inputlabel {
	top: -20px;
	font-size: 12px;
	color: dodgerblue;
}
	  
#date_of_birth {
	border: none;
	padding: 8px;
	border-radius: 10px;
	outline: none;
}