.flex-container, html, body {
    background-color:white;
    height: 99%;
}

.flex-container {
  display: flex;
  flex-direction: row;
}

.flex-item1 {
  background-color: blue;
  text-align: center;
  padding: 5px;
}

.flex-item2 {
  background-color: white;
  flex-grow: 1;
}
  
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  width: 200px;
  background-color: #f1f1f1;
}

li a {
  display: block;
  color: #000;
  padding: 8px 16px;
  text-decoration: none;
}

li a:hover {
  background-color: #555;
  color: white;
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
  overflow: hidden;
}