html,body{
margin:0;
padding:0;
height:100%;
overflow:hidden;
font-family:Arial;
}

#loading{
position:fixed;
top:0;
left:0;
width:100%;
height:100%;
background:#111;
color:#fff;
display:flex;
justify-content:center;
align-items:center;
z-index:9999;
font-size:18px;
}

#frame{
width:100%;
height:100%;
border:none;
}