nav {
  position: fixed;
  z-index: 20;
  background-image: linear-gradient(rgba(9, 17, 23, 1), rgba(19, 52, 71, 1), rgba(9, 17, 23, 1));
  width: 100%;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.8);
  text-align: center;
}

.topnav {
/*   margin-left: 35%; */
  overflow: hidden;
}

.topnav ul {
	width: 50%;
	margin-right: auto;
	margin-left: auto;
	padding-left: 20%;
}

.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding-top: 15px;
  padding-bottom: 10px;
  padding-left: 30px;
  padding-right: 30px;
  text-decoration: none;
  font-size: 20px;
  transition: all 0.2s ease-in-out; 
  -o-transition: all 0.2s linear;
  -moz-transition: all 0.2s linear; 
  -webkit-transition: all 0.2s linear;
/*   border-radius:10px 10px 0px 0px;  */
}

.topnav .icon {
  display: none;
}

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

.dropdown .dropbtn {
  font-size: 20px;
  border: none;
  outline: none;
  color: #f2f2f2;
  padding-top: 15px;
  padding-bottom: 10px;
  padding-left: 30px;
  padding-right: 30px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
  transition: all 0.2s ease-in-out; 
  -o-transition: all 0.2s linear;
  -moz-transition: all 0.2s linear; 
  -webkit-transition: all 0.2s linear;
/*   border-radius:10px 10px 0px 0px;  */
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: rgba(9, 17, 23, 0.9);
  min-width: 160px;
  box-shadow: 0px 6px 14px 0px rgba(0,0,0,0.9);
  z-index: 1;
  height: 400px;
  overflow-y: scroll;
}

.dropdown-content a {
  float: none;
  color: white;
  padding-top: 15px;
  padding-bottom: 15px;
  padding-left: 20px;
  padding-right: 10px;
  text-decoration: none;
  display: block;
  text-align: left;
  font-size: 18px;
  transition: all 0.2s ease-in-out; 
  -o-transition: all 0.2s linear;
  -moz-transition: all 0.2s linear; 
  -webkit-transition: all 0.2s linear;
  border-radius: 0px;
}

.topnav a:hover, .dropdown:hover .dropbtn {
  background-color: rgba(35, 105, 141, 0.7);
  color: white;
  
}

.radius {
/* 	border-radius: 0px 0px 10px 10px; */
}

.dropdown-content a:hover {
  background-color: rgba(35, 105, 141, 0.7);
  color: white;
}

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

/*<--------------- hamburger menu --------------->*/
@media screen and (max-width: 1300px) {
	.topnav ul {
	padding-left: 20%;
	width: 75%;
	}	
}

@media screen and (max-width: 900px) {
	.topnav ul {
	padding-left: 10%;
	width: 100%;
		
}
@media screen and (max-width: 700px) {
		.topnav {
	  margin-left: 0%;
	}

/* 	.topnav a:not(:first-child), .dropdown .dropbtn { */
/*     display: none; */
/*   } */
	 .topnav ul {
	 display: none;
	 width: 0%
 }
 
  .topnav a.icon {
    float: right;
    display: block;
  }
  
  .topnav a.icon:hover {
    float: right;
    display: block;
    border-radius: 0px;
  }
  .topnav.responsive {
  	position: relative;
  }
  
  .topnav.responsive a.icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  
  .topnav.responsive ul {
    float: left;
    display: block;
    text-align: left;
    margin: 0;
    padding: 0;
    
  }
  
  .dropdown-content {
  	 overflow-y: scroll;
  	 height: 400px;
  }
  .dropdown-content a {
  	padding-left: 40px;
/*   	padding-right: 30px; */
		min-width: 300px;
  }
  
  .topnav.responsive .dropdown {
  	float: left;
  }
  
  .topnav.responsive .dropdown-content {
  position: relative;
  }
  
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
}