* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font: 1em sans-serif;
}
.container {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.container h2 {
  font-size: 2em;
  margin-bottom: 1em;
}
input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

input[type="submit"] {
  width: 100%;
  background-color: #4caf50;
  color: white;
  padding: 14px 20px;
  margin: 8px 0;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

input[type="submit"]:hover {
  background-color: #45a049;
}

div {
  border-radius: 5px;
  background-color: #f2f2f2;
  padding: 20px;
}