.c5-title {
  text-align: center;
  background: url(../images/1200_90_tile.png) center no-repeat;
  background-size: 100% 100%;
  padding: 5px 0;
  margin: 0 0 20px;
  color: #fff;
}
@media screen and (max-width: 639px) {
	.c5-title {
	  font-size: (20/639)*100vw;
	}	
}