* {
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  justify-content: center;
  text-align: center;
  flex-direction: column;
}

#demo {
  margin: auto;
  padding: 1rem;
  width: 40vw;
  height: 40vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 1.5rem;
  background-color: black;
}

h1 {
  margin-bottom: 4rem;
  padding: 1rem;
}

.para {
  padding: 1rem;
}

p {
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.btn {
  margin-top: 4rem;
  margin-bottom: 5rem;
}

#w_btn1 {
  margin-right: 2rem;
  background-color: rgb(36, 176, 8);
}

#w_btn2 {
  margin-right: 2rem;
  background-color: rgb(8, 168, 158);
}

#m_btn {
  margin-left: 2rem;
  background-color: rgb(234, 25, 25);
}

button {
  padding: 0.5rem 0.7rem;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  font-weight: bold;
  color: white;
  border-radius: 0.4rem;
}

@media screen and (max-width: 600px) {
  button {
    font-size: .7rem;
    padding: 0.4rem 0.4rem;
  }
}