body {
  background: #b65353;
  font-family: Arial, sans-serif;
}

h2 {
  text-align: center;
}

h3 {
  text-align: left;
}

button, input, select, h3, h2 {
  font-size: 120%;
}

form {
  width: 350px;
  padding: 20px;
  border-radius: 10px;
  margin: auto;
  background-color: #fabf8a;
  box-sizing: border-box; 
}

input[type="number"], select {
  background: #d78a70;
  border: none;
  outline: none;
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  box-sizing: border-box;
  max-width: 100%; 
  color: white;
}

input[type="button"] {
  background: black;
  color: white;
  border: none;
  padding: 10px 15px;
  cursor: pointer;
  border-radius: 5px;
  width: 100%;
  transition: background 0.3s;
}

input[type="button"]:hover {
  background: #333;
}
input[type="number"]::placeholder {
  color: white;
}

#resultado {
  font-weight: bold;
  color: #000;
  text-align: center;
}