System default

Note: This setting is activated by default.

Use the "System Standard" button to select that the colour scheme of the web pages should be based on your system. "System standard" can be understood in two ways:

• A preference set in the web browser, which is then automatically taken into account on the UOL web pages (can be selected in the settings for some web browsers).
• An operating system-side selection for light/dark design, which also affects the menu and window frame appearance. If this is set to "Dark" or similar, this is also taken into account by the UOL web pages and can thus also change automatically depending on the time of day, for example.Configuration instructions

How the selection on the operating system side is set differs from browser to browser:

• Firefox: Under Settings → Extensions & Themes, select the theme "System Theme - Automatic". This switches the appearance of Firefox itself as well as the UOL websites displayed in it according to the operating system.
• Microsoft Edge: Under Settings → Appearance → Overall Appearance, select the button "System Default".
• Google Chrome: This browser immediately adopts the system default scheme.

Light

This is the familiar layout with dark font on a light background. By clicking this button, you explicitly select that you always want to use the light colour scheme.

Dark

This is the new layout for the "night mode" with light font on a dark background. By clicking this button, you explicitly select that you always want to use the dark colour scheme.

• In general, there has been atrend for some time that you can (and that many people actually do) activate a "dark" mode on your computer or smartphone as a whole, by which basically the window elements, menus etc. are alternatively displayed with a dark background and light font. On current Windows or Mac and many Linux computers, one can activate such a dark appearance instead of the light one or also automate that the screen surface automatically switches to "dark" in the evening and back to "light" during the day. This means that the screen adapts more to the environment, which is easier on the eyes.
• Visually impaired people also often like to use this option because they can read light writing on a dark background better than dark writing on a brightly lit background. So it also has to do with accessibility.
• Finally, a dark display on current smartphones/tablets with OLED screens causes less power to be consumed, because the energy consumption of the display actually depends on the brightness of the individual screen pixels. In this respect, there is also an ecological aspect there.
• Corresponding to this development, a technology has also been developed for web browsers in general to individualise the appearance in this way, i.e. to take into account the global setting of the respective computer or the explicit wish of the user and then also display the web page as a dark variant. In addition to such an automatic feature, an arbitrary colour change option of the appearance is of course welcome for accessibility reasons.

With the button "System Standard" you can select that the UOL web pages are oriented to the settings of the operating system. In order for this to work as desired, a few things may have to be configured.

Settings in the operating system

• Windows 10: Under System Settings → Personalisation → Colours, the "Dark" mode can generally be switched on and off under "Select colour ". Alternatively, "Custom" can also be selected, where the "Standard App Mode" can only be set to "Dark" for the apps (programmes) - independently of the "Standard Windows Mode", which can be set separately and only affects Windows itself (e.g. the Start menu). Windows 10 does not offer automatic switching between light and dark mode depending on the time of day. However, this can be achieved with the free programme Windows Auto Night mode(see the EXE file linked there under Assets).
• macOS: Under System Settings → General, the "Appearance" can be selected between "Light", "Dark" and "Automatic". Automatic" means that the appearance is automatically set to "Light" during the day and "Dark" at night.
• Linux: The various Linux distributions handle this setting differently, possibly this cannot be specified by the operating system, or there is no time-of-day-dependent switching available. In this case, the option remains to set the UOL web pages manually to "dark" mode.

Settings in the web browser

How the operating system-side selection is set differs from browser to browser:

• Firefox: Under Settings → Extensions & Themes → Themes, select and activate the theme "System Theme - Automatic". This switches the appearance of Firefox itself as well as the UOL websites displayed in it according to the operating system.
• Microsoft Edge: Under Settings → Appearance → Overall Appearance, select the button "System Default".
• Google Chrome: This browser immediately adopts the system default scheme.