* {
  font-family: monospace;
  box-sizing: border-box;
  outline: 1px solid green;
  background-color: rgba(16, 16, 16, 0.1)
}

body {
  margin: 0;
}

.container {
  display: flex;
  flex-flow: row wrap;
}

.column {
  flex: 1;
  flex-flow: column;
}

.menu {
  display: flex;
  flex-direction: column;
}

.a-mensa {
  background-color: rgba(16, 64, 16, 0.2);
}

.b-mensa {
  background-color: rgba(16, 16, 64, 0.2);
}