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

.dropbtn {
  .w3-bar-item ;
}

.padding5 {
  padding-right: 5%;
}

.padding15 {
  padding-right: 15%;
}

.link {
  display: inline-block;
  font: 20px arial, sans-serif; 
  vertical-align:middle;  
  padding: 20px;
}


.margin-x  {
  margin-right: 10%;
  margin-left: 10%;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  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: #555;
  color: white;
}

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

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

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child), .dropdown .dropbtn {
    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;
  }
  .topnav.responsive .dropdown {float: none;}
  .topnav.responsive .dropdown-content {position: relative;}
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
}

#L01 {
 line-height:110% 
}

#L02 {
 line-height:1.6 
}

.ex1 {
  background-color: #e6ffff;
  font: 12px arial, sans-serif;
  position: absolute;
  top:150px;
  right: 10px;  
  width: 250px;
  height: 60%;  
  border: 2px solid black;
  padding: 10px;
 overflow: auto;
}

.ex2 {
  background-color: #f8f8f8;
  font: 14px arial, sans-serif;
  position: absolute;
  top:100px;
  left: 100px;  
  width: 500px;
  height: 45%;  
  border: 2px solid black;
  padding: 10px;
 overflow: auto;
}