.button {
  width: 4.3555rem;
  height: 1.6666rem;
}
.button img {
  width: 100%;
}

.online-btn {
  display: block;
  border: 0;
}

.footer {
  position: fixed;
  
  left: 0;
  bottom: 0;
  z-index: 100;

  display: flex;
  justify-content: space-around;
  align-items: center;
  box-sizing: border-box;

  width: 100%;
  height: 2.0444rem;
  padding: 0 0.1333rem;

  background-image: url('../images/footer_bg.png');
  background-repeat: no-repeat;
  background-position: 0 0;
  background-size: 100% 2.0444rem;

}