/* Add a black background color to the top navigation */
.topnav {
  background-color: #333;
  overflow: hidden;
}

/* Style the links inside the navigation bar */
.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

/* Change the color of links on hover */
.topnav a:hover {
  background-color: #ddd;
  color: black;
}

/* Add a color to the active/current link */
.topnav a.active {
  background-color: #04AA6D;
  color: white;
}


body{
        margin: 0; /* Remove default margin */
    }
    iframe{      
        display: block;  /* iframes are inline by default */   
        height: 100vh;  /* Set height to 100% of the viewport height */   
        width: 100vw;  /* Set width to 100% of the viewport width */     
        border: none; /* Remove default border */
        background: lightyellow; /* Just for styling */
    }