@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-image/imageuploadloader.css

A bright theme for CKEditor 5.

/*
 * Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-licensing-options
 */

:root {
	--ck-color-upload-placeholder-loader: hsl(0, 0%, 70%);
	--ck-upload-placeholder-loader-size: 32px;
	--ck-upload-placeholder-image-aspect-ratio: 2.8;
}

.ck .ck-image-upload-placeholder {
	/* We need to control the full width of the SVG gray background. */
	width: 100%;
	margin: 0;

	&.image-inline {
		width: calc( 2 * var(--ck-upload-placeholder-loader-size) * var(--ck-upload-placeholder-image-aspect-ratio) );
	}

	& img {
		/*
		 * This is an arbitrary aspect for a 1x1 px GIF to display to the user. Not too tall, not too short.
		 * There's nothing special about this number except that it should make the image placeholder look like
		 * a real image during this short period after the upload started and before the image was read from the
		 * file system (and a rich preview was loaded).
		 */
		aspect-ratio: var(--ck-upload-placeholder-image-aspect-ratio);
	}
}

.ck .ck-upload-placeholder-loader {
	width: 100%;
	height: 100%;

	&::before {
		width: var(--ck-upload-placeholder-loader-size);
		height: var(--ck-upload-placeholder-loader-size);
		border-radius: 50%;
		border-top: 3px solid var(--ck-color-upload-placeholder-loader);
		border-right: 2px solid transparent;
		animation: ck-upload-placeholder-loader 1s linear infinite;
	}
}

@keyframes ck-upload-placeholder-loader {
	to {
		transform: rotate( 360deg );
	}
}