html body {
    width: 100%;
    height: 100%;
    margin-top: 0px;
    margin-left: 0px;
    background: url(http://2pia.com.br/assets/imagens/backgroung.jpg) no-repeat center center fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
div#sucesso {
width: 100%;
height: 100% !important;
line-height:100vh;
text-align: center;
position: absolute;
}
.logo {
    width: 260px;
    background-color: rgba(255, 255, 255, 0.2);
    padding: 20px 100px 20px 100px;
}