/* Reset básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f0f0f0;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }
  
  /* Cabeçalho */
  header {
    background: #2c3e50;
    color: #fff;
    padding: 20px;
    text-align: center;
  }
  
  /* Conteúdo principal */
  main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
    padding: 20px;
  }
  
  h1, h2 {
    margin-bottom: 15px;
    text-align: center;
  }
  
  /* Agrupamento das formas */
  .formas {
    text-align: center;
  }
  
  /* Quadrados */
  .quadrados div {
    width: 80px;
    height: 80px;
    background: #3498db;
    display: inline-block;
    margin: 10px;
    border-radius: 8px; /* borda levemente arredondada */
    transition: transform 0.3s;
  }
  
  .quadrados div:hover {
    transform: scale(1.1);
  }
  
  /* Círculos */
  .circulos div {
    width: 80px;
    height: 80px;
    background: #e74c3c;
    display: inline-block;
    margin: 10px;
    border-radius: 50%;
    transition: transform 0.3s;
  }
  
  .circulos div:hover {
    transform: scale(1.1);
  }
  
  /* Rodapé */
  footer {
    background: #2c3e50;
    color: #fff;
    text-align: center;
    padding: 10px;
  }