body {
  font-family: Arial, sans-serif;
  margin: 0em;
  padding: 0em;
}

@media screen and (max-width: 800px) {
  body {
    padding-top: 20em;
  }
}

@media screen and (min-width: 801px) {
  main {
    padding-right: 20em;
  }
}

header {
  top: 0;
  margin-top: 0;
  text-align: center;
  margin-bottom: 20px;
  background-color: #ccc;
}

section {
  padding: 1em;
}

article {
  margin-bottom: 2em;
  padding: 1em;
  border: 1px solid #aaa;
  background-color: #eef;
}

#player-section {
  border: 2px solid #c00;
  padding: 10px;
  width: 250px;
  box-shadow: 5px 5px 15px #ccc;
}

#status {
  margin-top: 10px;
  width: 220px;
}

button {
  margin-left: 10px;
  padding: 4px;
}

.collapsible {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 10px;
  width: 20em;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

.active, .collapsible:hover {
  background-color: #ccc;
}

.collapsible:after {
  content: '\02795'; /* Unicode character for "plus" sign (+) */
  font-size: 13px;
  color: white;
  float: right;
  margin-left: 5px;
}

.active:after {
  content: "\2796"; /* Unicode character for "minus" sign (-) */
}

.content {
  padding: 0 18px;
  background-color: white;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

#alphabet-table {
  text-align: center;
  display: none;
}

.lesson-text {
  font-style: italic;
  margin-bottom: 1em;
  padding: 1em;
  background-color: #ccf;
}

.tecken-list {
  display: block;
  list-style-type: none;
  margin: 1em;
}

.tecken-list::after, .clear {
  clear: both;
}

.tecken-list p {
  background-color: #ffa;
  float: left;
  width: 5em;
  margin: 0.2em;
  padding: 0.2em;
}

#player-section {
  top: 2em;
  right: 2em;
  position: fixed;
  background-color: #ccf;
}