Style Customization

Following the docs. I've done everything step by step but

.fi-sidebar {
    background-color: #fafafa;
}

.fi-sidebar {
    background-color: #fafafa;
}

.fi-sidebar {
    @apply bg-gray-50 dark:bg-gray-950 !important;
}

.fi-sidebar {
    @apply bg-gray-50 dark:bg-gray-950 !important;
}

doesn't work . I was testing it by changing sidebar color to see if it works but nothing changed .