@charset "utf-8";
body > div {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
}

body div div {
  position: relative;
}
body div div a {
  width: 550px;
  position: absolute;
  bottom: 52px;
  left: 45px;
}
.btn {
  display: inline-block;
  text-align: center;
  text-decoration: none;
  line-height: 180px;
  -webkit-transition: all .3s;
  transition: all .3s;
}
.btn:hover, .btn:active {
  transform: scale(0.9, 0.9);
}
img {
  width: 100%;
}

@media screen and (max-width: 640px) {
	body div div a {
	width: 90%;
    position: absolute;
    bottom: 30px;
    left: 5%;
}
}