wp-calypso/client/sites/components/panel-sidebar/style.scss

@import "@wordpress/base-styles/breakpoints";
@import "@wordpress/base-styles/mixins";
@import "@automattic/color-studio/dist/color-variables";
@import "@automattic/typography/styles/variables";

.panel-with-sidebar {
	display: flex;
	gap: 20px;
	flex-direction: column;

	.navigation-header {
		margin-bottom: 16px;
	}

	.header-cake__back {
		font-size: 0.875rem;
	}

	> div:not(:first-child),
	> main:not(:first-child) {
		width: 100%;
	}

	.form-text-input, .form-select {
		font-size: 0.875rem !important;
	}

	@include break-small {
		flex-direction: row;
		align-items: flex-start;
	}
}

.panel-sidebar {
	position: sticky;
	top: -24px;
	flex-shrink: 0;
	padding: 24px 24px 20px;
	margin: -23px -24px -19px;
	list-style: none;
	background: #fff;
	z-index: 99;

	@include break-small {
		top: 0;
		min-width: 160px;
		padding: 0;
		margin: 0;
	}
}

.components-button.panel-sidebar-tab {
	border-radius: 4px;
	width: 100%;
	padding: 8px;
	margin-bottom: 2px;
	height: 40px;
	justify-content: flex-start;
	color: var(--studio-gray-100);
	white-space: nowrap;
	font-size: $font-body-small;

	&:visited, &:hover:not(:disabled):not([aria-disabled="true"]) {
		color: var(--studio-gray-100);
	}

	&:active, &:focus {
		outline: none;
		box-shadow: none;

		.accessible-focus & {
			box-shadow: inset 0 0 0 2px var(--color-primary-light) !important;
		}
	}

	&:hover {
		background-color: #f7f7f7;
		border-radius: 4px;
	}

	&--active {
		background-color: #f0f0f0;
		font-weight: 600;
		border-radius: 4px;
	}
}

.panel-sidebar-dropdown {
	.select-dropdown__container {
		display: block;
	}
}