Since 1.9.0
.notice--{info | success | warning | danger}
<div class="notice--info txt--white"><button class="close"> </button>.notice--info</div><div class="notice--success txt--white"><button class="close"> </button>.notice--success</div><div class="notice--warning txt--white"><button class="close"> </button>.notice--warning</div><div class="notice--danger txt--white"><button class="close"> </button>.notice--danger</div>