body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
  }
  
  header {
    background: #4caf50;
    color: white;
    padding: 1rem;
    text-align: center;
  }
  
  main {
    padding: 2rem;
  }
  
  .conteudo-principal {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
  }
  
  .coluna-esquerda {
    flex: 2;
  }
  
  .coluna-direita {
    flex: 1;
    background: white;
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
  }
  
  canvas {
    max-width: 100%;
    height: auto;
  }
  
  section {
    margin-bottom: 2rem;
  }
  
  #form-transacao input,
  #form-transacao button {
    display: block;
    width: 100%;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
  }
  
  ul {
    list-style: none;
    padding: 0;
  }
  
  li {
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    background: #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 4px;
  }
  
  li.entrada {
    border-left: 5px solid #4caf50;
  }
  
  li.saida {
    border-left: 5px solid #f44336;
  }
  
  button {
    cursor: pointer;
  }
  
  @media (max-width: 768px) {
    .conteudo-principal {
      flex-direction: column;
    }
  
    .coluna-direita {
      margin-top: 2rem;
    }
  
    li {
      flex-direction: column;
      align-items: flex-start;
    }
  }