html {
background: url(baustelle.svg) no-repeat center center fixed;
background-size: contain;
-webkit-background-size: contain;
-moz-background-size: contain;
-o-background-size: contain;
background-color: #ffffff;      
}  
/**/
body {
font-size: 62.5%;
}
/**/
#zahl {
position:relative;
top: 10px;
left: 10px;
color:#99d9f5;   
font-size: 10px;
font-size: 1rem;
}
/**/ 
#zahl {
position absolute;
left:10px;
top:10px;
}