*{margin: 0;}
.ble { 
    width: 66%;
    font-size: 20px;
    background-color: blue;
    color: white;
}

.blk {
    width: 50%;
    font-size: 20px;
    background-color: black;
    color: antiquewhite;
}

.ylw {
    width: 45%;
    font-size: 20px;
    background-color: yellow;
    color: black;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #221186;
}

ul li {
  float: left;
}

ul li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

ul li a:hover {
  background-color: #ec0f0fc1;
}

.dark{
  background-color: black;
  color: white;
}