woocommerce/plugins/woocommerce-admin/client/homescreen/activity-panel/style.scss

@mixin accordion-header {
	.woocommerce-accordion-header {
		order: 1;
		text-align: left;
		.woocommerce-accordion-title {
			margin-right: $gap;
		}
	}
}
.woocommerce-accordion-card {
	.components-card__header,
	.components-panel__body-title .components-button {
		font-size: 20px;
		line-height: 28px;
		color: $gray-900;
		&:focus {
			box-shadow: unset;
			outline: unset;
		}
	}

	.components-card__header {
		height: 60px;
		@include accordion-header();
	}

	.components-panel__body-title {
		margin: 0;
		padding: $gap-small 0;
		height: 60px;
		.components-button {
			width: 100%;
			padding-left: 24px;
			font-style: normal;
			font-weight: 400;
			display: flex;
			flex-direction: row;

			@include accordion-header();

			.woocommerce-accordion-header {
				width: 50%;
			}

			& > span {
				order: 2;
				width: 50%;
				text-align: right;
				.components-panel__arrow {
					width: 30px;
					height: 30px;
					vertical-align: text-top;
				}
			}
		}
	}

	.woocommerce-activity-card {
		padding: $gap-largest/2 $gutter $gutter;
		&__header {
			margin-bottom: $gap-small;
		}
	}

	.woocommerce-layout__activity-panel-outbound-link {
		display: flex;
		justify-content: space-between;
		align-items: center;
		height: 50px;
		border-bottom: 1px solid $gray-100;
		padding: $gap $fallback-gutter;
		padding: $gap $gutter;
		font-size: 13px;
		font-weight: 500;
		line-height: 18px;
		margin: 0;
		text-decoration: none;

		.gridicon {
			display: none;
		}

		&:hover {
			background: $gray-200;
		}

		&:active {
			background: $gray-100;
		}

		&:focus {
			background: $gray-200;
			box-shadow: inset 0 0 0 1px $box-shadow-blue,
				inset 0 0 0 2px $gray-200;
		}

		&:hover,
		&:focus {
			.gridicon {
				display: initial;
			}
		}

		&:active {
			.gridicon {
				display: initial;
			}
		}
	}

	.woocommerce-layout__activity-panel-empty {
		border-top: 1px solid $gray-200;
	}

	.woocommerce-activity-card__button {
		&:focus {
			box-shadow: unset;
			outline: unset;
			border: 1px solid $gray-200;
		}
	}
}

.components-panel__body-title {
	.woocommerce-accordion-card .is-opened & {
		border-bottom: 1px solid $gray-200;
	}
}