.topnav {
  overflow: hidden;
  background-color: #4CAF50;
}

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

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

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

.topnav a:visited {
  background-color: #4CAF50;
  color: white;
}

.topnav .icon {
  display: none;
}

.linktext a {
color: black;
}

@media only screen and (max-width: 768px) {
  /* For mobile phones: */
  [class*="col-"] {
    width: 100%;
  }
  class=centertext {
	 width: 100%;
	 height=auto;
	}
	
.topnav a {
 font-size: 16px;
}
	
.h3 {
	font-size:15px
	}	
	
}

@media screen and (max-width: 768px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 768px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
    
}
}