:root {
	--input-padding-x: 1.5rem;
	--input-padding-y: .75rem;
}
html, body {
	height: 100%;
}
body {
	background: linear-gradient(#000, #111);
}
.card-signin {
	border: 0;
	box-shadow: 0 0.5rem 1rem 0 rgba(0, 0, 0, 0.1);
	top: 30%;
}
.card-signin .card-title {
	margin-bottom: 2rem;
	font-weight: 300;
	font-size: 1.5rem;
}
.card-signin .card-body {
	padding: 2rem;
}
.form-signin {
	width: 100%;
}
.form-signin .btn {
	font-size: 80%;
	letter-spacing: .1rem;
	font-weight: bold;
	padding: 1rem;
	transition: all 0.2s;
}
.form-label-group {
	position: relative;
	margin-bottom: 1rem;
}
.form-label-group>input,
.form-label-group>label {
	padding: var(--input-padding-y) var(--input-padding-x);
}
.form-label-group>label {
	position: absolute;
	top: 0;
	left: 0;
	display: block;
	width: 100%;
	margin-bottom: 0;
	/* Override default `<label>` margin */
	line-height: 1.5;
	color: #495057;
	border: 1px solid transparent;
	transition: all .1s ease-in-out;
}
.form-label-group input::-webkit-input-placeholder {color: transparent;}
.form-label-group input:-ms-input-placeholder {color: transparent;}
.form-label-group input::-ms-input-placeholder {color: transparent;}
.form-label-group input::-moz-placeholder {color: transparent;}
.form-label-group input::placeholder {color: transparent;}
.form-label-group input:not(:placeholder-shown) {
	padding-top: calc(var(--input-padding-y) + var(--input-padding-y) * (2 / 3));
	padding-bottom: calc(var(--input-padding-y) / 3);
}
.form-label-group input:not(:placeholder-shown)~label {
	padding-top: calc(var(--input-padding-y) / 3);
	padding-bottom: calc(var(--input-padding-y) / 3);
	font-size: 12px;
	color: #777;
}