body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: Arial, sans-serif;
}
.container {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.controls {
  padding: 5px;
  color: white;
  background-color: #52595D;
  border-bottom: 1px solid #ddd;
}
.viewer {
  flex-grow: 1;
  width: 100%;
  background: url(space.png) repeat;
}
label {
  margin-right: 10px;
  font-weight: bold;
}
select {
  padding: 5px;
  min-width: 300px;
}