We will use :root because we want to avail the variables globally. In the top left, select File > Options > General > Office Theme. Dark mode switch (light mode) Dark mode switch (dark mode) Now whenever a user clicks on the button the whole layout will change from dark to light and vice-versa. It matches with the root element in your document tree, generally the tag. How to change your theme Windows macOS To change the background color and design of all your Microsoft 365 apps: Open a Microsoft 365 app, like Word, Excel, or PowerPoint. They are set using custom property notation (e.g., -main-color: black ) and are accessed using the var() function (e.g., color: var(-main-color) )įirst, we'll add our light or default mode css variables to the :root pseudo class. Here's the tldr version - Custom properties (sometimes referred to as CSS variables or cascading variables) are entities defined by CSS authors that contain specific values to be reused throughout a document. when a user changes a toggle, to switch between the light and dark themes. Let's look at Dark mode too before we begin. ![]()
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