Make show information alert colors accessible

[haietza]

Several of the text/background colors used on the assignment/quiz/choice/etc show information alerts are not accessible. Please consider modifying the styles to meet color contrast requirements.

If you are interested, these are the style overrides I put in place in our theme:

// Collapsed topics success alerts .format-topcoll .ct-activity-date-submitted { background-color: #d4edda; }

.format-topcoll .ct-activity-date-submitted a { color: #155724; }

// Collapsed topics warning alerts .format-topcoll .ct-activity-date-nearly-due { background-color: #FFF3CD; }

.format-topcoll .ct-activity-date-nearly-due a { color: #856404; }

// Collapsed topics danger alerts .format-topcoll .ct-activity-date-overdue { background-color: #f8d7da; }

.format-topcoll .ct-activity-date-overdue a { color: #721c24; }

.format-topcoll .ct-activity-date-overdue .text-warning { color: #721C24 !important; }

[gjb2048]

@haietza Thanks for this, I'll look as soon as I can.