Template:Ambox/styles.css

.ambox {
  border: 1px solid #a2a9b1;
  border-collapse: collapse;
  width: 100%;
  margin: .5em 0;
  background: #f8f9fa;
  font-size: 88%;
}
.ambox .ambox-image { width: 40px; text-align: center; }
.ambox .ambox-text { padding: .25em .5em; }

.ambox-notice   { background: #fff8e5; } /* yellow */
.ambox-content  { background: #f5faff; } /* pale blue */
.ambox-style    { background: #eff8f1; } /* pale green */
.ambox-warning  { background: #fff2e6; } /* orange-ish */
.ambox-delete   { background: #ffecec; } /* pale red */