body, html {
  height: 100%;
  margin: 0;
 }
    
.navbar {
  overflow: hidden;
  background-color: #000000;
    z-index: 1;
}

.navbar a {
  float: left;
  font-size: 16px;
  font-family: "arial";
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  z-index: 1;
}

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

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

.navbar a:hover, .dropdown:hover .dropbtn {
  background-color: #d30000;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

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

.dropdown-content a:hover {
  background-color: #ddd;
}

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


.header {
  background-color: #4c7391;
  padding: 1px;
  text-align: center;
}

    h1 {
  font-family: "Courier New";
  font-size: 40px;
  font-weight: bold;
  padding-top: 10px;
  padding-bottom: 10px;
  text-align: center;
  color: #ffffff;  
    }

    h2 {
  font-family: "Courier New";
  font-size: 35px;
  font-weight: bold;
  padding-top: 30px;
  padding-bottom: 0px;
/*  border-bottom-style: solid;*/
/*  border-top-style: solid;*/
  text-align: center;
  color: #4c7391;
    }

    h3 {
  font-family: "Courier New";
  font-size: 35px;
  font-weight: bold;
  padding-top: 30px;
  padding-bottom: 30px;
  text-align: center;
  background-color:#4c7391;
  color: #ffffff;
    }

    h4 {
  font-family: "Courier New";
  font-size: 35px;
  font-weight: bold;
  padding-top: 30px;
  padding-bottom: 20px;
  padding-left: 50px;
  border-bottom-style: solid;
  color: #000000;
    }
    p {
  font-family: "arial";
  font-size: 20px;
  font-weight: normal;
  padding-left: 100px;
  padding-right: 100px;
  color: #000000;
  text-align: justify; 
/*  line-height:1.6;*/
    }
    p1 {
  font-family: "arial";
  font-size: 22px;
  font-weight: bold;
  padding-left: 50px;
  padding-right: 100px;
  color: #000000;
  line-height:1.6;
    }
    p2 {
  font-family: "arial";
  font-size: 20px;
  font-weight: bold;
  color: #000000;
  padding-left: 50px;
  line-height:1.6;
    }
      p3 {
  font-family: "arial";
  font-size: 20px;
  font-weight: bold;
  color: #ffffff;
  padding-left: 0px;
  line-height:1.6;
    }
    li {
  font-family: "arial";
  font-weight: normal;
  font-size: 20px;
  line-height:1.6;
    }
    
  ol{
    padding-left: 170px;
    padding-right: 170px;
    color: #0470bf;
    }

  ul{
    padding-left: 100px;
    padding-right: 100px;
    color: #000000;
    }

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

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


 code{
  font-family: "arial";
  font-size: 20px;
  font-weight: normal;
  color: #00ac0d;
  line-height:1.6;
    }

 code1{
  font-family: "arial";
  font-size: 14px;
  font-weight: normal;
  color: #04229d;
  line-height:1.6;
    }

div.a {
        text-align: center;
}
.footer {
  background-color: #d0d8de;
  padding-left: 60px;
  text-align: left;
}

div.ex1 {
  margin-left: auto;
  margin-right: auto;
  background-color: #daeff7;
  width: 700px;
  height: 400px;
  overflow: scroll;
}

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