body {
    background-image: url(rect4352-2.png);
    background-position: center bottom;
    background-size: cover;     
    background-attachment: fixed;
    font-family: roboto;          
    font-size: 15px;
}

#polimer-logo {
   background-image: url("logo-polimer.png");
   background-position: center bottom;
   background-repeat: no-repeat;
   width: auto; 
   height: auto;
   margin: 0;
   padding: 0;
}