body{
    min-height: 100vh;
    background-image: url(http://i.imgur.com/ro5bn3v.png);
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-size:cover;
}


.white{
    text-align: center;
    margin: 1em;
    padding: 1em;
    background-color:rgba(255,255,255,0.5) ;
    border-radius: 1em;
}
*{
    text-align: center;
}