body{
  background-color: gray;
}
h3{
  text-align: center;
  color: white;
}
/*janela modal é aquela janela que abre dentro do site*/
.modal{
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: rgba(0,0,0,0.8);
    z-index: 99999;
    opacity:0;
    -webkit-transition: opacity 400ms ease-in;
    -moz-transition: opacity 400ms ease-in;
    transition: opacity 400ms ease-in;
    pointer-events: none;
  }


  .modal:target{
    opacity: 1;
    pointer-events: auto;
  }
  .modal > div {
    width: 200px;
    position: relative;
    margin: 10% auto;
    padding: 15px 20px;
    background: #fff;
  }
  .fechar {
      /*tudo relacionado ao butão*/
    position:absolute;
    width: 40px; /*largura do botao*/
    right: 15px;
    top: 10px;
    text-align: center;
    line-height: 30px;
    margin-top: 5px;
    background: #000000cc;
    border-radius: 50%;
    font-size: 16px;
    color: whitesmoke;
  }