woocommerce/plugins/woocommerce-admin/client/inbox-panel/index.scss

#activity-panel-inbox {
	margin: 0 $gap-large;
}

.woocommerce-layout__inbox-panel-header {
	padding: $gap-large;

	.woocommerce-homepage-column & {
		padding: 0 24px;
	}
}

.woocommerce-inbox-message-enter {
	opacity: 0;
	max-height: 0;
	transform: translateX(50%);
}

.woocommerce-inbox-message-enter-active {
	opacity: 1;
	max-height: 100vh;
	transform: translateX(0%);
	transition: opacity 500ms, transform 500ms, max-height 500ms;
}

.woocommerce-inbox-message-exit {
	opacity: 1;
	max-height: 100vh;
	transform: translateX(0%);
}

.woocommerce-inbox-message-exit-active {
	opacity: 0;
	max-height: 0;
	transform: translateX(50%);
	transition: opacity 500ms, transform 500ms, max-height 500ms;
}

.woocommerce-inbox-dismiss-all-modal {
	width: 565px;
	max-width: 100%;

	.components-modal__content::before {
		margin-bottom: 0;
	}

	.components-modal__header {
		border-bottom: 1px solid #ddd !important;
	}

	.woocommerce-usage-modal__message {
		box-sizing: border-box;
		border-bottom: 1px solid #ddd;
		padding: $gap * 2;
		display: flex;
		flex-direction: row;
		justify-content: space-between;
		background: #fff;
		align-items: center;
		height: 60px;
		z-index: 10;
		position: relative;
		position: sticky;
		top: 0;
		margin: 0 -#{$gap * 2} $gap-large;
		font-size: 1.2em;
	}

	.woocommerce-usage-modal__actions {
		display: flex;
		justify-content: flex-end;
		margin-top: $gap;

		button {
			margin-left: $gap;
		}
	}
}