body {
     width: 100%;
     background-color: lightblue;
     background: linear-gradient(135deg, #1F9FFF, white 65%, #1F9FFF);   
     margin: 0px;
     padding: 0px;
     font-family: Verdana, sans-serif;
     font-size: 3em;
     // line-height: 1.5;
    }

    div#main {
     width: auto;
     margin: auto;
     border: 1px solid gray;
     background-color: #ffffff;
     // border-radius: 30px;                    
     // box-shadow: 0px 0px 20px gray;          

     }   

    header {
    /*background-color: lightblue;*/
      background: linear-gradient(135deg, #1F9FFF, white 50%, #1F9FFF);
    /*background-image: url("img/1.jpg");*/
      padding: 50px;
      text-align: center;
      border-bottom: solid 1px gray;
    
     }
     
    nav {
     // float: left;
     // width: 120px;
     padding: 20px;
     margin: 0px;
     text-align: center;
     
     }

    section {
     // margin-left: 180px;  
     background-image: url("img/snezi.gif");
     padding: 20px;
     border-top: solid 1px gray;
     text-align: justify;

     }

    footer {
     background-color: lightblue;
     background: linear-gradient(135deg, #1F9FFF, white 50%, #1F9FFF);
     text-align: center;
     border-top: solid 1px gray;
     clear: both;                         
     padding: 20px;
     
     }

.topnav {
  overflow: hidden;
  background-color: #333;
  border-radius: 30px;
  font-family: Arial, Helvetica, sans-serif;
  
}

.topnav a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 1em;
}

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

.topnav .icon {
  display: none;
}

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

.dropdown .dropbtn {
  font-size: 1em;    
  border: none;
  outline: none;
  color: white;
  padding: 12px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: inherit;
  min-width: auto;
  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;
}

.topnav a:hover, .dropdown:hover .dropbtn {
  background-color: blue;
  color: white;
}

.dropdown-content a:hover {
  background-color: blue;
  color: white;
}

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

@media screen and (max-width: 1090px) {
  .topnav a:not(:first-child), .dropdown .dropbtn {
    display: none;
  }
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 1090px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .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;
  }
}