src/css/Header.css

.header {
	font-family: var(--font-2);
	position: sticky;
	top: 0;
	background-color: var(--medium-grey);
	box-shadow: 0 var(--small) var(--small) var(--light-grey);
	padding: var(--medium);
	z-index: 2;
}

.header__wrapper {
	max-width: 40em;
	width: 100%;
	padding: var(--medium) var(--medium) 0 var(--medium);
	margin: 0 auto;
}

.header__title {
	background-color: var(--dark-grey);
	text-align: center;
	font-size: 2.5rem;
	padding: 1rem;
	border-radius: var(--large);
	margin-bottom: 0.3em;
	box-shadow: 0 0 var(--small) var(--lighter-grey);
	line-height: 0.9;
}

.header__buttons {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: var(--medium);
}

.header__info {
	display: flex;
	font-size: 0.9rem;
	margin-top: 1em;
	align-items: center;
	justify-content: space-between;
	min-height: 32px;
}

.header__switch-container {
	display: flex;
	align-items: center;
}

.header__switch-label {
	margin: 0;
	color: var(--lighter-grey);
}

.header__switch-label--selected {
	color: white;
}

.header__checkbox {
	height: 0;
	width: 0;
	visibility: hidden;
}

.header__switch {
	cursor: pointer;
	width: 36px;
	height: 20px;
	margin-right: 6px;
	background: var(--light-grey);
	border-radius: 100px;
	position: relative;
}

.header__switch:after {
	content: '';
	position: absolute;
	top: 2px;
	left: 2px;
	width: 16px;
	height: 16px;
	background: white;
	border-radius: 90px;
	transition: background-color 0.2s;
}

.header__checkbox:checked + .header__switch {
	background: var(--lighter-grey);
}

.header__checkbox:checked + .header__switch:after {
	left: calc(100% - 2px);
	transform: translateX(-100%);
}

.header__switch:active:after {
	width: 18px;
	height: 18px;
	top: 1px;
}

.header__time {
	visibility: hidden;
}

.header__time--visible {
	visibility: visible;
}

@media (min-width: 640px) {
	.header__title {
		font-size: 3rem;
	}

	.header__dropdown--mobile-only {
		display: none;
	}
}


@media (max-width: 640px) {
	.header {
		padding: var(--small);
	}

	.header__wrapper {
		padding: var(--small) var(--small) 0 var(--small);
	}

	.header__title {
		font-size: 1.75rem;
		padding: 0.6rem;
	}

	.header__info {
		margin-top: 0.3em;
	}

	.header__buttons {
		display: none;
	}
}

.header__dropdown {
	background-color: var(--lighter-grey);
	padding: 0.3em;
	border-radius: 16px;
	font-family: var(--font-1);
	outline: none;
}

.header__dropdown-container {
	display: flex;
	align-items: center;
	font-family: var(--font-2);
}

.header__dropdown-label {
	margin: 0 0.3em 0 0;
}