body {
     background-color: lightblue;
     background: linear-gradient(135deg, #1F9FFF, white 65%, #1F9FFF);   /* pozadi s sikmym linearnim gradientem */
     margin: 0px;
     padding: 0px;
     font-family: Verdana, sans-serif;
     font-size: 0.8em;
     line-height: 1.5;
     
    }



    main {
     width: 950px;
     margin: 2em auto;
     border: 1px solid gray;
     background-color: #ffffff;
     border-radius: 30px;                    /* zaoblene rohy */
     box-shadow: 0px 0px 20px gray;          /* stin boxu */

     }   

    header {
      padding: 50px;          
      text-align: center;
      border-bottom: solid 1px gray;
   
     }
     
    nav {
     float: left;
     width: 200px;
     padding: 10px;
     margin: 0px;
     text-align: center;
  
     }

    aside {
     float: left;
     width: 200px;
     padding: 10px;
     text-align: justify;
     // border-left: solid 1px gray;
     }
     
    section#prvni {
     float: left;
     width:230px;
     padding: 10px;
     // border-left: solid 1px gray;
     text-align: justify;
     // border-right: solid 1px gray;
     }
     
    section#druhy {
     float: left;
     width:230px;
     padding: 10px;
     border-left: solid 1px gray;
     text-align: justify;
     border-right: solid 1px gray;
     }
     
    footer {
     padding: 20px;
     text-align: center;
     border-top: solid 1px gray;
     clear: both;                  /* vypnuti obtekani leveho panelu s navigaci */

     }

     li {
      list-style-type: none;
      margin-left: -30px
     }
     
     img.hamburger, ul ul
     {
      display: none;
     }