/* 背景*/
body {
  margin-bottom: 20px;
  padding: 30px;
  text-align: center;
  background: rgba(255,246,189,1.00);
}

.btn,
a.btn,
button.btn {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.5;
  position: relative;
  display: inline-block;
  padding: 1rem 4rem;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  letter-spacing: 0.1em;
  color: #212529;
  border-radius: 0.5rem;
}

a.btn-coupon {
  font-size: 1.8rem;
  line-height: 1.2;

  padding: 2rem 3rem;

  color: #fa4141;
  border-radius: 0;
  background: rgba(36,182,253,1.00);
}

a.btn-coupon i {
  font-size: 1.6rem;

  position: absolute;

  width: 1rem;

  -webkit-transition: all 1s;

  transition: all 1s;
  text-align: right;

  color: #fff;
  background: #fa4141;
}

a.btn-coupon i.fa-position-top {
  top: -1em;
  left: 1rem;
}

a.btn-coupon i.fa-position-bottom {
  right: 1rem;
  bottom: -1em;
  left: auto;
  -webkit-transform: scale(-1, 1);
  transform: scale(-1, 1);
}

a.btn-coupon span {
  font-family: "Roboto", sans-serif;
  font-size: 4rem;
  font-style: italic;
}

a.btn-coupon:before {
  position: absolute;
  top: -9px;
  left: -9px;
  width: calc(100% + 18px);
  height: calc(100% + 18px);
  content: "";
  border: 2px dashed #fff;
}

a.btn-coupon:hover {
  color: #E5710B;
  background: rgba(247,222,0,1.00);
}

a.btn-coupon:hover i {
  width: 90%;
}