body {
  width: 100%;
  height: 100%;
  background-image: url(fibonacci.jpg);
  background-size: cover;
  background-attachment: fixed;
  background-position: center center;
  background-repeat: no-repeat;
  background-color: #464646;
}
.intro {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 400px;
  width: 50%;
  margin: 70px 100px;

  background-color: rgba(250, 245, 245, 0.9);
  padding: 40px 20px;
  border-radius: 5px;
  box-shadow: 5px 55px 50px 20px #b6b6b6;
}
.n-input {
  padding: 7px;
}
button {
  background-color: rgba(92, 4, 4, 0.9);
  color: white;
  border-radius: 50px;
  border-style: none;
  padding: 7px;
}
.fibonacciSequence {
  color: rgb(121, 3, 3);
}

@media screen and (max-width: 900px) {
  .intro {
    min-height: 600px;
    width: 80%;
    margin: 0px;
  }
  button {
    margin-top: 8px;
  }
}