img.buttons {
    width:120px;
    border-style: solid;
    margin: 5px;
}

#grau {
    position:absolute;
    top:0px;
    left:0px; 
    background-color:rgba(0,0,0,0.5);
    width:100%;
    height:100%;
    display:none;
    align-items: center;
    justify-content: center;    
    z-index:100;
}

#musikdauer {
    position:absolute;
    bottom:20px;
    right:20px;
    color:white;
        
}

#startknopf {
   position:absolute;
   top:0px;
   left:0px;
   background:white;
   width:100%;
}
#startknopf img {
   display: block;
  margin-left: auto;
  margin-right: auto;
  width:200px;
  margin-top:200px;
}

#stop {
     position:absolute;
   bottom:20px;
   left:0px;
   z-index:200;
 
}

#stop img {
    height:20px;
}