nav {
  height: 100px;
  line-height: 100px;
  margin: 0 auto;
  width: 1200px;
}
nav img {
  vertical-align: middle;
}
nav span {
  font-size: 22px;
  font-weight: bold;
  line-height: 0px;
  color: #000000;
  padding-top: 16px;
  letter-spacing: 2px;
}
.code {
  margin: 40px 147px;
  text-align: center;
  display: inline-block;
}
.code img {
  width: 256px;
}
.code button {
  border: solid 1px #707070;
  width: 300px;
  border-radius: 30px;
  height: 56px;
  font-size: 28px;
  font-weight: bold;
  color: #000000;
  margin-top: 20px;
  background-color: #fff;
}
.footer {
  position: absolute;
  bottom: 30px;
  left: 39%;
  z-index: -1;
}