style.css

html,
body {
	height: 90vh;
	font: 14px/1.5 -apple-system, system-ui, "Segoe UI", Roboto,
		"Helvetica Neue", Ubuntu, sans-serif;

	padding: 0 2rem;
}

.input {
	background: #fdfdfd;
	padding: 1rem;
	border: 1px solid #dddddd;

	display: grid;
	gap: 2rem 1rem;
	grid-template-columns: auto 1fr;

	margin-bottom: 1rem;
}

.output {
	background: lightgray;
	padding: 1rem;
	border: 1px solid gray;

	display: grid;
	gap: 1rem;
	grid-template-columns: auto 1fr;
}

.checkbox-list > input[type="checkbox"]:not(:first-child) {
	margin-left: 1rem;
}

.textbox-list-3 {
	display: grid;
	gap: 1rem;
	grid-template-columns: auto 100px auto;
	justify-self: flex-start;
}

.textbox-list-3 > label {
	grid-column: 1;
}

.button-9 {
	appearance: button;
	backface-visibility: hidden;
	background-color: #405cf5;
	border-radius: 6px;
	border-width: 0;
	box-shadow: rgba(50, 50, 93, 0.1) 0 0 0 1px inset,
		rgba(50, 50, 93, 0.1) 0 2px 5px 0, rgba(0, 0, 0, 0.07) 0 1px 1px 0;
	box-sizing: border-box;
	color: #fff;
	cursor: pointer;
	font-size: 100%;
	height: 3em;
	line-height: 1.15;
	outline: none;
	overflow: hidden;
	padding: 0 25px;
	position: relative;
	text-align: center;
	text-transform: none;
	transform: translateZ(0);
	transition: all 0.2s, box-shadow 0.08s ease-in;
	user-select: none;
	-webkit-user-select: none;
	touch-action: manipulation;
	width: 100%;
}

.button-9:disabled {
	cursor: default;
	background-color: #b5bce6;
}

.button-9:focus {
	box-shadow: rgba(50, 50, 93, 0.1) 0 0 0 1px inset,
		rgba(50, 50, 93, 0.2) 0 6px 15px 0, rgba(0, 0, 0, 0.1) 0 2px 2px 0,
		rgba(50, 151, 211, 0.3) 0 0 0 4px;
}

#error-message {
	color: red;
	min-height: 1rem;
	vertical-align: middle;
}