body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  color: #333;
}

p {
  font-size: 1.2em;
  color: #555;
}

input[type="number"] {
  width: 60px;
  padding: 10px;
  font-size: 1em;
  margin: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

button {
  padding: 10px 20px;
  font-size: 1em;
  color: white;
  background-color: #007BFF;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #0056b3;
}

.flex{
  display:flex;
  flex-wrap: nowrap;
}

.flex>*{
  flex:1;
  width: auto;
}

@media (max-width: 600px) {
  input[type="number"] {
    width: 100%;
  }

  button {
    width: 100%;
  }
}