MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Custom CSS for pages using the "custom-background" class */
.custom-background {
    /* Add any additional styles you want for the container here */
}

/* Adjust the styles for the body element within the "custom-background" container */
.custom-background body {
    /* You can override or add more styles for the body element here */
}