main {
  padding: 50px;
  padding-bottom: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--background-main);
}

.fila {
  display: flex;
  width: 90%;
  justify-content: space-around;
  text-align: center;
}

.columna {
  flex: 1;
  padding: 10px;
}

.columna h3 {
  color: var(--background-header);
  font-size: 1.2em;
  margin-bottom: 10px;
}

.columna p {
  color: var(--text-color);
}

@media (max-width: 768px) {
  .fila {
    flex-direction: column;
    align-items: center;
  }

  .columna {
    width: 100%;
    margin-bottom: 20px;
  }
  
  main {
    padding: 20px;
    padding-bottom: 50px;
  }
}