body{
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main{
    flex-grow: 1;
}

/* estilos.css */

body {
  background: linear-gradient(to bottom, #0f0f0f, #1a1a1a);
  font-family: 'Segoe UI', sans-serif;
  color: #fff;
  text-align: center;
  padding-top: 70px;
}

h1 {
  font-size: 2.5em;
  text-shadow: 0 0 10px #f0f;
  margin-bottom: 20px;
}

#pantalla {
  font-size: 4em;
  font-weight: bold;
  color: #0ff;
  text-shadow: 0 0 20px #0ff;
  margin-bottom: 30px;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

input, button {
  padding: 15px 25px;
  margin: 10px;
  font-size: 1em;
  border-radius: 10px;
  border: none;
}

input {
  width: 200px;
  text-align: center;
}

button {
  background: #f0f;
  color: #000;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 0 10px #f0f;
  transition: transform 0.2s, background 0.3s;
}

button:hover {
  transform: scale(1.1);
  background: #0ff;
  color: #111;
}