body
{ margin-left: 1em;
  margin-right: 1em;
}
img
{ pointer-events: none;
}
.lesson
{ margin-left:  1em;
  margin-right: 1em;
}
.hidden
{ display:none;
}
.indent1
{ margin-left: 2em;
}
.indent2
{ margin-left: 4em;
}
.mono
{ font-family: "Lucida Console", "Courier New", monospace;
}
.trigger
{ font-style: italic;
  background-color: white;
}
.flex-container
{ display: flex;
  align-items: center;
  justify-content: space-between;
}