Código CSS:
Ver original@charset "UTF-8";
.Fondo{
width: 100vw;
height: 100vh;
position:fixed;
padding: 32.2vh 35.382vw;
vertical-align: middle;
background: fixed url(http://cdn3.computerhoy.com/sites/computerhoy.com/files/styles/fullcontent/public/novedades/webassembly.jpg?itok=uvuzO-2m);
background-size: cover;
}
.PanelLogin{
position: absolute;
border: 1px solid white;
background-color: white;
padding: 1% 80px;
margin:-65px -69px;
display: inline-block;
text-align: center;
box-shadow: 0px 0px 50px 50px rgba(0,0,0,.25);
}
.PanelLoginTipo1{
font-family: "Open Sans";
width: 25vw;
display: block;
text-align:center;
}
.PanelLoginTipo2{
font: 600 20px "Open Sans";
color: #0072c6;
padding-bottom: 3vh;
text-align:center;
width: 25vw;
display: block;
}
.PanelLoginTipo3{
text-align: center;
}
body{
margin: 0 auto;
}
.btn{
color:blue;
padding:4%;
margin:3%;
background: #FFFFFF;
border:transparent;
}
.btn:hover{
background:#E6E6E6;
cursor:pointer;
}
.form-control{
padding:10px;
margin:10px;
}
.control-label{
font-family:arial;
}
ahi esta el css3 lo modique para que se estuviera en el centro :) espero y te aya ayudado :)