wp-calypso/packages/help-center/src/components/help-center-content.scss

.help-center__container {
	.help-center__container-content {
		flex-grow: 1;
		scroll-behavior: smooth;
		overflow-y: auto;
		padding: 0;

		.help-center__container-content-wrapper {
			height: auto;

			> * {
				box-sizing: border-box;
			}
		}
	}
}