Image background on light mode

How to have a custom image background on light mode? i've tried overriding the css fi-body class but it the bg image sticks even on dark mode

Solution

.dark .fi-body {
    background-image : none;
}

.dark .fi-body {
    background-image : none;
}

.dark .fi-body {
    background-image : none;
}

.dark .fi-body {
    background-image : none;
}