body {
  background-color: #1f1f1f;
  font-family: Arial, Helvetica, sans-serif;
}

.contenedor {
  display: flex;
  height: 90vh;
}

.contenido {
  display: flex;
  flex-direction: column;
  width: 100%;
  min-width: 214px;
  max-width: 600px;
  gap: 10px;
  margin: auto;
  background-color: #222222;
  border-radius: 10px;
  padding: 20px;
}

.input {
  padding: 0 15px;
  border-radius: 10px;
  background-color: #292929;
}

#display {
  width: 100%;
  margin: 0;
  padding: 20px 0;
  border: none;
  border-radius: 10px;
  background-color: #292929;
  color: white;
  text-align: right;
  font-size: 1.8em;
}

.botones {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 3px;
}

.btn {
  box-sizing: content-box;
  min-width: 30px;
  height: 50px;
  border-radius: 10px;
  border: none;
  background-color: #494949;
  color: white;
  font-size: 1.25em;
  font-weight: 600;
  cursor: pointer;
}

.btn:nth-child(1) {
  grid-column: 1 / 3;
}

.btn:nth-child(2) {
  grid-column: 3 / 5;
}

.operador {
  background-color: #292929;
}

.igual {
  background-color: #7f92ff;
  color: black;
}

.btn:hover {
  background-color: #636363;
}

.operador:hover {
  background-color: #494949;
}

.igual:hover {
  background-color: #aab6ff;
}