stylesheet.css

.btn {
  background-color: inherit;
  border: none;
  color: white;
  padding: 16px 17px;
  font-size: 16px;
  cursor: pointer;
  inline-height: 16;
}

.header {
	z-index: 10;
	width: 100%;
	height: 50px;
	background: #004696;
	position: sicky;
}

.box {
  margin: 0 auto;

  width: 800px; 
  height: 200px;
  padding: auto;


width: 90%;
max-width: 1200px;
margin: 0 auto;
text-align: left;
}

body {
  padding: 0;
  margin: auto;
  background-color: #fff;
  color: #192846;
  font-size: 100%;
  font-weight: 500;
  text-align: justify;
  font-family: 'testfont';

 }
 
  p.ex1 {
  padding-top: 15px;
  padding: 0;
  margin: auto;
  background-color: #fff;
  color : #3332222;
  font-size : 100%;
  font-weight: 500;
  text-align : justify;
  font-family: 'testfont';
  padding-bottom: 15px;
}

  IMG.displayed {
 
   align:center;
   width:800px;
   height:auto;
   max-height:100%;
   padding: 0;
    border: 10px solid transparent;
 
   
   
    } 

@font-face {
    font-family: testfont;
    src: url("fonts/MuseoSans_500.otf");
}
.navbar {
  overflow: hidden;
  background-color:#004696;
 
}

.navbar a {
  float: left;
  font-size: 16px;
  font-color: white;
  color: white;
  text-align: left;
  padding: 14px 16px;
  text-decoration: none;
  
}

.subnav {
  float: left;
  overflow: hidden;
}

.subnav .subnavbtn {
  font-size: 16px;  
  border: none;
  outline: none;
  color: none;
  padding: 14px 16px;
  background-color: lightblue;
  font-family: inherit;
  margin: 0;
  
}

.topnav-right {
  float: right;
  
}

.navbar a:hover, .subnav:hover .subnavbtn {
  background-color: none;
}



/*======================================================================================*/
/*	Content formats  
/*======================================================================================*/
/* Headlines */
h1 {
  color: #192846;
  font-size: 2.8rem;
  font-weight: 500;
  line-height: 120%;
  margin: 0 0 40px 0; 
   text-align: left;}


h2 {
	color: #192846;
	font-size: 2.4rem;
	font-weight: 500;
	line-height: 2;
	margin: 0 0 -20 0;
	text-align: left;
	padding: 0;
	vertical-align: top;
}

h3 {
  color: #192846;
  font-size: 1.6rem;
  font-weight: 500;
  line-height: 120%;
  margin: 0 0 15px 0; }

h4 {
  color: #ffcd00;
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 120%;
  margin: 0 0 10px 0; }
  
  
  .topnav {
  overflow: hidden;
  background-color: white;
}

.active {
  background-color: white;
  color: white;
}

.topnav .icon {
  display: none;
}

.dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  font-size: 17px;    
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: white;
  min-width: 160px;
  box-shadow: white;
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.topnav a:hover, .dropdown:hover  {
  background-color: #555;
  color: white;
}


.dropdown:hover .dropdown-content {
  display: block;
}

  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .topnav.responsive .dropdown {float: none;}
  .topnav.responsive .dropdown-content {position: relative;}
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
  
.topnav-right {
  float: right;
}
  

  
/* Hyperlinks */
  a{
    transition: all ease 0.15s;
   }
    a:hover {
       color: lightblue;
    }

    a:active {
      text-decoration: underline;
    }
 /* keyboard/programming letters type */
 /* This text is in Lucida Sans Typewriter */
.program { 
	font-family: Lucida Sans Typewriter,Lucida Console,monaco,Bitstream Vera Sans Mono,monospace; 
}
 
/* up button */ 
 #myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  font-size: 18px;
  border: none;
  outline: none;
  background-color: #004ea8;
  color: white;
  cursor: pointer;
  padding: 15px;
  border-radius: 4px;
}

#myBtn:hover {
  background-color: #555;
}