wp-calypso/client/a8c-for-agencies/components/sidebar-placeholder/style.scss

@mixin loading-effect {
	animation: loading-fade 1.6s ease-in-out infinite;
	background: var(--color-sidebar-menu-selected-background);
}

.a4a-sidebar-placeholder {
	.sidebar-v2__main,
	.sidebar-v2__footer {
		padding-inline: 8px;
	}
}

.a4a-sidebar-placeholder__header-icon {
	@include loading-effect;
	width: 32px;
	height: 32px;
}

.a4a-sidebar-placeholder__menu-item {
	@include loading-effect;
	width: 100%;
	height: 32px;
	margin-block-end: 4px;
	border-radius: 4px;
}