Module:Message box/fmbox.css

/* Cell sizes for ambox/tmbox/imbox/cmbox/ombox/fmbox/dmbox message boxes */
th.mbox-text, td.mbox-text {   /* The message body cell(s) */
	padding: 0.25em 0.9em;     /* 0.9em left/right */
}
td.mbox-image {                /* The left image cell */
	padding: 2px 0 2px 0.9em;  /* 0.9em left, 0px right */
}
td.mbox-imageright {           /* The right image cell */
	padding: 2px 0.9em 2px 0;  /* 0px left, 0.9em right */
}
/* Footer and header message box styles */
table.fmbox {
    clear: both;
    margin: 0.2em 0;
    width: 100%;
    border: 1px solid #a2a9b1;
    background-color: var( --background-color-interactive-subtle, #f8f9fa );
    color: var( --color-base, #202122 );
    box-sizing: border-box;
}
table.fmbox-system {
    background-color: var( --background-color-interactive-subtle, #f8f9fa );
}
table.fmbox-warning {
    border: 1px solid #bb7070;  /* Dark pink */
    background-color: var(--background-color-destructive-subtle--hover, #ffdad3);  /* Pink */
}
table.fmbox-editnotice {
    background-color: transparent;
}