*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  background: #E9BF8B;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.serial {
  width: 350px;
  height: 66px;
  padding: 20px;
  background-color: #2C2D2A;
  color: #E9BF8B;
  margin: 40px auto 0;
  border-radius: 4px;
  text-align: center;
  font-size: 22px;
  font-weight: bold;
}
.generate {
  display: block;
  width: fit-content;
  margin: 20px auto;
  background-color: #2C2D2A;
  color:#E9BF8B;
  padding: 10px 20px;
  border-radius: 4px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s;
  user-select: none;
}
.generate:hover {
  color: #2C2D2A;
  border: 1px solid #2C2D2A;
  background-color: #E9BF8B;
  box-shadow: 5px 5px 1px #2C2D2A;
}