Olá!
No curso quando o instrutor clica no botão descanso curto a cor é alterado. Segui os códigos como foi mostrado e não sei o que poderia ser.
meu código...
const html = document.querySelector('html')
const focoBt = document.querySelector('.app__card-button--foco')
const curtoBt = document.querySelector('.app__card-button--curto')
focoBt.addEventListener('click', () => {
html.setAttribute('data-contexto', 'foco')
})
curtoBt.addEventListener('click', () => {
html.setAttribute('data-contexto', 'descanso curto')
})
<!DOCTYPE html>
<html lang="pt-br" data-contexto="foco">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Fokus</title>
<link rel="shortcut icon" href="./imagens/favicon.ico" type="image/x-icon">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css"
integrity="sha512-NmLkDIU1C/C88wi324HBc+S2kLhi08PN5GDeUVVVC/BVt/9Izdsc9SVeVfA1UZbY3sHUlDSyRXhCzHfr6hmPPw=="
crossorigin="anonymous" referrerpolicy="no-referrer" />
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link
href="https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Prata&family=Unbounded:wght@200;300;400;500;600;700;800;900&display=swap"
rel="stylesheet">
<link rel="stylesheet" href="./styles.css">
<script src="./script.js" defer></script>
</head>
<body>
<main class="app">
<header class="app__header">
<figure class="app__logo-figure">
<img class="app__logo-image" src="/imagens/logo.png" alt="">
</figure>
</header>
<section class="app__section-banner-container">
<h1 class="app__title">
Otimize sua produtividade,<br>
<strong class="app__title-strong">mergulhe no que importa.</strong>
</h1>
<figure class="app__image-figure">
<img class="app__image" src="/imagens/foco.png" alt="">
</figure>
</section>
<section class="app__section-card-container">
<div class="app__card">
<ul class="app__card-list">
<li class="app__card-list-item">
<button data-contexto="foco" class="app__card-button app__card-button--foco active">Foco</button>
</li>
<li class="app__card-list-item">
<button data-contexto="short" class="app__card-button app__card-button--curto">Descanso curto</button>
</li>
<li class="app__card-list-item">
<button data-contexto="long" class="app__card-button app__card-button--longo">Descanso longo</button>
</li>
</ul>
<div id="timer" class="app__card-timer"></div>
<ul class="app__card-list">
<li class="app__card-list-item">
<label class="toggle">
<input class="toggle-checkbox" type="checkbox" id="alternar-musica">
<div class="toggle-switch"></div>
</label>
</li>
<li class="app__card-list-item">
<label class="app__card-list-label" for="alternar-musica">
Música
</label>
</li>
</ul>
<div class="app__card-primary-button-wrapper">
<button id="start-pause" class="app__card-primary-button">
<img class="app__card-primary-butto-icon" src="/imagens/play_arrow.png" alt="">
<span>Começar</span>
</button>
</div>
</div>
</section>
<footer class="app__footer">
<p class="app__footer-text">
Projeto fictício e sem fins comerciais. Imagens geradas por IA no Adobe Firefly.Desenvolvido por Alura.
</p>
</footer>
</main>
</body>
</html>
Resultado do instrutor.
Meu...
Alteração no Java...