.To-do-list{
    text-align: center;
}
.todo-input{
    font-size: 16px;
    padding: 5px;
    text-align: center;
}
#lista-tarefas{
    text-align: center;
}
.tarefa{
    display: inline-block;
    width: 200px;
    margin: 10px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #f9f9f9;
}
body.white-theme {
    background: #fff;
    color: #222;
}

body.dark-theme {
    background: #222;
    color: #fff;
}
body.white-theme .tarefa {
    background-color: #f9f9f9;
    color: #222;
}

body.dark-theme .tarefa {
    background-color: #333;
    color: #fff;
}

.todo-input input,
.todo-input button {
    background: inherit;
    color: inherit;
    border: 1px solid #888;
}
#alternar-tema {
    position: absolute;
    top: 20px;
    right: 30px;
    padding: 8px 16px;
    border-radius: 5px;
    border: none;
    background: #444;
    color: #fff;
    cursor: pointer;
    transition: background 0.3s;
    z-index: 10;
}
#alternar-tema:hover {
    background: #666;
}