body {
  font-family: 'Roboto', sans-serif;
  font-size: 1rem;
}
a:link {
  color: black;
  text-decoration: none;
}
a:visited {
  color: black;
}
a:hover, summary:hover {
  color: blue;
}
.tooltip {
  position: relative;
  display: inline-block;
  cursor: pointer;
}
.tooltiptext {
  visibility: hidden;
  width: 130px;
  background-color: grey;
  color: #ffffff;
  text-align: center;
  border-radius: 6px;
  padding: 5px 0;
  position: absolute;
  z-index: 1;
  bottom: 100%;
  left: 65%;
  margin-left: -65px;
}
.tooltip:hover .tooltiptext {
  visibility: visible;
}
.textblock {
  width: 800px;
  max-width: 95%;
  margin: 2px auto;
  padding: 3px;
  border: none;
  text-align: justify;
}
.zeiger {
  cursor: pointer;
}