.header {
  position: relative;
  background: #00bcd4;
  height: 49px;
  padding-left: 10px;
  color: #fff;
  font-weight: bold;
  line-height: 49px;
  font-size: 30px;
}

.header .button {
  width: 30px;
  height: 25px;
  padding: 0;
  background-image: linear-gradient(#fff 5px, transparent 5px);
  background-size: 100% 10px;
  color: transparent;
  background-color: transparent;
  border: 0;
  font-size: 0;
  vertical-align: middle;
}