.bt-impact { font-weight: bold; font-size:100%; position: relative; }
.bt-impact .bt-impact-fire { position: absolute; }
.bt-impact.impact-left { text-align: left; }
.bt-impact.impact-centered { text-align: center; }
.bt-impact.impact-right { text-align: right; }
.bt-impact.impact-small  { font-size: 75%;}
.bt-impact.impact-large  { font-size: 200%;}
.bt-impact.impact-xlarge  { font-size: 350%;}
.bt-impact.impact-super  { font-size: 500%;}