*,
:before,
:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

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

.ui.dropdown .button {
  display: block;
  position: relative;
  width: 15em;
  height: 30px;
  padding: 0 30px 0 10px;
  border: 1px solid yellow;
  border-radius: 3px;
  font-family: "Gentium Book Basic", Gentium, 'Times New Roman';
  font-size: 18px;
  line-height: 30px;
  color: yellow;
  text-decoration: none;
  white-space: nowrap;
  background-color: darkblue;
}
.ui.dropdown .button:after {
  position: absolute;
  top: 50%;
  right: 10px;
  margin-top: -2px;
  border-width: 4px 4px 0;
  border-style: solid;
  border-color: yellow;
  content: '';
}
.ui.dropdown .button:hover, .ui.dropdown.active .button {
  border-color: yellow;
  background-color: darkblue;
}

.ui.dropdown .layer {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  margin: 2px 0 0;
  padding: 0;
  border: 1px solid yellow;
  border-radius: 3px;
  background-color: darkblue;
  line-height: 1.5;
  list-style-type: none;
}
.ui.dropdown .layer li > a {
  display: block;
  padding: 5px 10px;
  font-size: large;
  font-family: "Gentium Book Basic", Gentium, 'Times New Roman'; 
  color: yellow;
  text-decoration: none;
}
.ui.dropdown .layer li > a:hover, .ui.dropdown .layer li.active > a {
  background-color: darkred !important;
}

.ui.dropdown.active {
  z-index: 1;
}
.ui.dropdown.active .button:after {
  border-top-width: 0;
  border-bottom-width: 4px;
  border-top-color: yellow;
  border-bottom-color: yellow;
}
.ui.dropdown.active .layer {
  display: block;
}

.ui.dropdown.active a:link {
color:white;
text-decoration:none;
}

.ui.dropdown.active a:visited {
color:white;
text-decoration:none;
}

.ui.dropdown.active a:hover {
color:white;
text-decoration:none;
}

.ui.dropdown.active a:active {
color:white;
text-decoration:none;
}

.button {
margin-bottom:0em;
}

div.navigation {position: sticky; top: 0; text-align:center; z-index: 150; } 
.navigation {position: sticky; top: 0; text-align:center; z-index: 150; }