.topnav {
  overflow: hidden;
}

.topnav a {
  float: left;
  display: block;
  color: #000000;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 14px;
font-weight: bold;
}

.topnav a:hover {
color: #FFFFFF;
 background-color: #31A6C5;
    background-image: -moz-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.3) 100%);
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(0, 0, 0, 0)), color-stop(100%, rgba(0, 0, 0, 0.3)));
    background-image: -webkit-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.3) 100%);
    background-image: -o-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.3) 100%);
    background-image: -ms-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.3) 100%);
    -moz-transition: all 0.3s ease-out;
    -webkit-transition: all 0.3s ease-out;
    -o-transition: all 0.3s ease-out;
    -ms-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
border-radius: 5px;
}

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

.topnav .icon {
  display: none;
font-size: 20px;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;

  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}