body, html {
  width: 100%; 
  height: 100%; 
  margin: 0;  
  font-family:verdana,sans-serif;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {background-color: #ddd;}
.dropdown:hover .dropdown-content {display: block;}
.dropdown:hover .dropbtn {background-color: #A0F050;}

.dropbtn {
  background-color: #7CB612;
  color: white;
  border: none;
}

.row-container {display: flex; width: 100%; height: 100%; flex-direction: column; overflow: hidden;}
.first-row {padding: 8px; background-color: #A0A0A0;  }
.second-row { flex-grow: 1; border: none; margin: 0; padding: 0; }