Omnino is a windowing system for web applications, inspired by the Acme text editor. It divides the display, or a portion of it, into columns and windows which may be created, deleted, resized, and reordered. A live demo is available.
CSS variables control visual aspects of Omnino. An example follows.
:root {
/* The title text which is displayed in the top-left of the Omnino container. */
--omnino-title: "My Website";
/* The color of an empty Omnino column. */
--omnino-background-color: #151515;
/* The color of the border which separates Omnino columns and window. */
--omnino-border-color: rgb(54, 54, 54);
/* The background color of Omnino's menus. */
--omnino-menu-background: #252526;
/* The foreground text color of Omnino's menus. */
--omnino-menu-fgcolor: #858585;
/* The background color of Omnino's menu items when the mouse hovers over them. */
--omnino-link-hover-color: #1c1c1c;
/* The background color of Omnino's menu items when the mouse is pressed over them. */
--omnino-link-active-color: #101010;
/* The color of the handle used to reposition columns and windows. */
--omnino-handle-color: #569cd6;
}