Rocket.Chat/packages/rocketchat-theme/client/imports/components/modal/full-modal.css

.full-modal {
	position: absolute;
	top: 0;
	left: 0;

	display: flex;

	width: 100%;
	height: 100%;
	justify-content: center;

	&__wrapper {
		position: relative;

		width: var(--modal-wrapper-width);
		margin: var(--modal-wrapper-margin) 0;
	}

	&__back-button {
		position: absolute;
		top: 0;
		right: 0;

		display: flex;

		color: var(--modal-back-button-color);
		align-items: center;
	}

	&__back-text {
		margin-right: 2px;

		line-height: 22px;
	}

	&__back-icon {
		transform: rotate(45deg);

		font-size: 1rem;
	}
}

@media (width < 1024px) {
	.full-modal {
		padding: 50px;

		&__wrapper {
			margin: 0;
		}
	}
}

@media (width <= 400px) {
	.full-modal {
		&__back-button {
			top: -1.5rem;
		}
	}
}

.rtl .full-modal {
	&__back-button {
		left: 0
	}

	&__back-text {
		margin-left: 0.375rem;
	}
}