A "Bootstrapesque" style of alerts done in Materialize. Also have a look at this style of alert which is a direct copy of Google's styling.
Typical pallette.
infoThis is an alert: It has text within it.
report_problemThis is an alert: It has text within it.
reportThis is an alert: It has text within it.
check_circleThis is an alert: It has text within it.
Material color palette
infoThis is an alert: It has text within it.
report_problemThis is an alert: It has text within it.
reportThis is an alert: It has text within it.
check_circleThis is an alert: It has text within it.