body {
  background-color: lightgray;
  color: black;
  font-family: "Helvetica", "Arial", "Liberation Sans", "Verdana", sans-serif;
}


main {
  width: 95%;
	margin: 15px;
}


/* This is the highlighter color */
mark {
  background-color: yellow;
  color: black;
}


/* Begining of Navigation Bar */
 /* Navbar container */
.navbar {
  position: sticky;
  position: -webkit-sticky;
  top: 0;
  float: left;
  width: 100%;
  background-color: #333;
  font-family: "Helvetica", "Arial", "Liberation Sans", "Verdana", sans-serif;
}

/* Links inside the navbar */
.navbar a {
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

/* The dropdown container */
.dropdown {
  float: left;
  overflow: hidden;
}

/* Dropdown button */
.dropdown .dropbtn {
  font-size: 16px;
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit; /* Important for vertical align on mobile phones */
  margin: 0; /* Important for vertical align on mobile phones */
}

/* Add a background color to navbar links on hover */
.navbar a:hover, .dropdown:hover .dropbtn {
  background-color: darkblue;
}

/* Dropdown content (hidden by default) */
.dropdown-content {
  display: none;
  position: absolute;
  background-color: blue;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

/* Links inside the dropdown */
.dropdown-content a {
  float: none;
  color: white;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

/* Add a background color to dropdown links on hover */
.dropdown-content a:hover {
  background-color: darkblue;
}

/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content {
  display: block;
} 
/* End of Navigation Bar */


/* Begining of Collapsible Sections */
/* Style the button that is used to open and close the collapsible content */
.collapsible {
  background-color: green;
  color: white;
  cursor: pointer;
  padding: 18px;
  width: 90%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

.active, .collapsible:hover {
  background-color: yellow;
}

.content {
  padding: 0 18px;
  display: none;
  overflow: hidden;
  background-color: #f1f1f1;
}

.collapsible:after {
  content: '\02795'; /* Unicode character for "plus" sign (+) */
  font-size: 13px;
  color: white;
  float: right;
  margin-left: 5px;
}

.active:after {
  content: "\2796"; /* Unicode character for "minus" sign (-) */
}
/* End of Collapsible Sections */