html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  font-size: 18px;
  font-family: Arial;
}

sup, sub {
  line-height:0px;
}

.page {
  display: flex;
  flex-flow: column;
}

.content
{
  display: flex;
  flex: 1 1 auto;
  flex-flow: column;
}

.tree 
{
  display: flex;
  flex: 1 1 auto;
  float: left;
  position: absolute;
  margin-left: 1em;
  width: 10.5em;
  left: 0px;
}

.worksheet 
{
  flex: 1 1 auto;
  position: relative;
  width:70%;
  margin-left: 12.5em;
  padding-left: 2em;
  left: 0px;
  border-left: #dcdcdc 1px solid;
}

.worksheet_m
{
  margin: 1em;
}

.navigator {
  flex: 0 1 auto;
  margin-left: 1em;
}

.content_link
{
  background-color: #ffffff;
  color: #8b4513;
  outline: none;
  text-decoration: none;
}
.content_link_grey
{
  background-color: lightGrey;
  color: #ff1313;
  outline: none;
  text-decoration: none;
}
.content_link:hover, .content_link:focus, .content_link:active
{
  background-color: #ffffff;
  color: #8b4513;
  outline: none;
  text-decoration: underline;
  display:inline-block;
}

.tooltip {
  position: relative;
  display: inline-block;
  cursor: pointer;
  width: max-content; 
}

.tooltiptext {
  visibility: hidden;
  white-space: pre;
  background-color: lightGrey;
  color: #283747;
  text-align: center;
  border-radius: 6px;
  padding: 15px 10px;
  position: absolute;
  z-index: 1;
  bottom: 50%;
/*  left: 65%;*/
  margin-left: -280px;
  margin-bottom: 10px;
  font-size: 16px;
  font-family: Arial;
}

.tooltiptext_short {
  visibility: hidden;
  white-space: pre;
  background-color: lightGrey;
  color: #283747;
  text-align: center;
  border-radius: 6px;
  padding: 15px 10px;
  position: absolute;
  z-index: 1;
  bottom: 50%;
/*  left: 65%;*/
  margin-left: -100px;
  margin-bottom: 10px;
  font-size: 16px;
  font-family: Arial;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
  width: auto;
}

.tooltip:hover .tooltiptext_short {
  visibility: visible;
  width: auto;
}
</style>