Can you take a screenshot of the custom CSS in the Theme editor? Not sure if the double dash -- before the theme-style-alarm-icon was changed to – by the community editor or you actually had – in the CSS, and the name should be all lower case.
.tile.–theme-style-Alarm-icon .tile-footer { display:none }
.tile.--theme-style-alarm-icon .tile-footer { display:none }