/* 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: 18px ;
  text-decoration: none;
  font-size: 18px;
}

/* 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: #B3B1BB;
  color: white;
}

h1 {
  text-align:center;
  font-weight: bold;
  font-size: 30px;
}

{
 text-align: center;
 font-weight: normal;
 font-size: 18px:

}

img{
  display: block;
  margin-left: auto;
  margin-right: auto;
}