const html = document.querySelector('html');
const botonEnfoque = document.querySelector('.app__card-button--enfoque');
const botonCorto = document.querySelector('.app__card-button--corto');
const botonLargo = document.querySelector('.app__card-button--largo');
botonEnfoque.addEventListener('click', () => {
html.setAttribute('data-contexto', 'enfoque')
});
botonCorto.addEventListener('click', () => {
html.setAttribute('data-contexto', 'descanso-corto')
});
botonLargo.addEventListener('click', () => {
html.setAttribute('data-contexto', 'descanso-largo')
});