Make X/Twitter spoilers looks better

user.css

/* Based on https://github.com/noriokun4649/SensitiveImageLover/blob/8173587fae62ecf57d5ca8304dcc6e768d94c9e2/override.css */

/* Remove blur, but make darker to distinguish */
div .r-yfv4eo {
    filter: brightness(70%);
}

/* Remove background color for the warning in tweet */
/* as the shadow is already applied in the filter above */
div .r-drfeu3 {
    background-color: transparent
}