html {
  height: 100%;
  background-image: url('../images/background.png') !important;
  background-position: center !important; /* Center the image */
  background-repeat: no-repeat !important; /* Do not repeat the image */
  background-size: cover !important; /* Resize the background image to cover the entire container */
  background-attachment: scroll !important;
  background-color: black;
}

.submenu {
  border: 1px solid #cccccc;
  border-radius: 5px;
}

/*
Navigation CSS 
*/

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.topnav {
  overflow: hidden;
  width: 100%;
  background-color: #333;
}

.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none !important;
  font-size: 17px;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav a.active {
  background-color: #4CAF50;
  color: black;
}

.topnav .icon {
  display: none;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}