* {
    margin: 0;
    padding: 0;
    font-family: Roboto serif, sans-serif;
  }
  
  body {
    background-color: crimson;
  }
  
  #cabecalho , #conteudo-principal {
    background-color: ivory;
    width: 80%;
    padding: 10px;
    margin: 20px auto;
    border-radius: 5px;
    box-shadow: 3px 3px rgba(0 , 0 , 0 , 0.4);
  }
  
  #cabecalho h1 {
    margin-bottom: 15px;
  }
  
  #inicio {
    width: 100%;
  }
  
  #texto-tarefa {
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid black;
    border-radius: 2px;
    font-size: 16px;
  }
  
  button {
    padding: 10px;
    border: 1px solid;
    cursor: pointer;
    border-radius: 4px;
  }
  
  .positivo {
    background-color: rgb(47 , 193 , 140);
    color: ivory;
    transition-duration: 0.4s;
  }
  
  .positivo:hover {
    background-color: ivory;
    color: black;
    border: 1px solid rgb(47 , 193 , 140);
  }
  
  .negativo {
    background-color: crimson;
    color: ivory;
    transition-duration: 0.4s;
  }
  
  .negativo:hover {
    background-color: ivory;
    color: black;
    border: 1px solid crimson;
  }
  
  .neutro {
    background-color: rgb(255 , 183 , 0);
    color: ivory;
    transition-duration: 0.4s;
  }
  
  .neutro:hover {
    background-color: ivory;
    color: black;
    border: 1px solid rgb(255 , 183 , 0);
  }
  
  .neutro-negativo {
    background-color: rgb(111 , 29 , 27);
    color: ivory;
    transition-duration: 0.4s;
  }
  
  .neutro-negativo:hover {
    background-color: ivory;
    color: black;
    border: 1px solid rgb(111 , 29 , 27);
  }
  
  #lista {
    width: 40%;
    display: inline-block;
  }
  
  #lista-tarefas {
    font-size: 16px;
    margin-left: 15px;
    margin-bottom: 10px;
    padding: 5px;
  }
  
  li {
    margin: 7px;
    padding: 5px;
  }
  
  #botoes {
    width: 40%;
    display: inline-block;
    margin-left: 200px;
    vertical-align: top;
  }
  
  .bloco-botao {
    display: block;
    margin: 10px 0;
  }
  
  .selected {
    background-color: gray;
  }
  
  .completed {
    text-decoration: line-through;
  }