body {
    margin: 0;
    padding: 20px;
    font-family: Arial, sans-serif;
    min-height: 100vh;
    position: relative;
    cursor: pointer;
}

.quadrado {
    position: absolute;
    width: 50px;
    height: 50px;
    background-color: rgba(0, 100, 255, 0.5);
    border: 2px solid blue;
    border-radius: 4px;
    pointer-events: none; /* Permite clicar através do quadrado */
    transform: translate(-50%, -50%); /* Centraliza no clique */
    display: none;
    transition: opacity 0.3s; /* Efeito de fade opcional */
    opacity: 0;
}

.quadrado.mostrar {
    display: block;
    opacity: 1;
}