html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}
iframe {
    position: absolute;
    top: 0; bottom: 0; left: 0; width: 100%; height: 100%;
    border: none;
    box-sizing: border-box; -moz-box-sizing: border-box; -webkit-box-sizing: border-box;
}
#ynhtopbar {                                                                                                                                                                         
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 110px;
    background-color: black;
    color: black;            
    z-index: 1000;
    font-family: "helvetica";
}     
#ynhtoggle {
    cursor: pointer;
    position: absolute;
    background-color: black;
    text-align: center;
    padding-top: 10px;
    top: 100px;
    left: 50px;
    width: 80px;
    height: 18px;
    z-index: 900;
    color: white;
    font-weight: bold;
    font-size: 13px;
    border-radius: 3px;
}
#ynhtoggle:hover {
    text-decoration: none;
}