.table-of-contents.open {
  background-color: #ffffff;
  border-radius: 20px;
}

h1 {
  text-align: center;
}

.spoiler-box__title.js-spoiler-box-title {
  font-weight: bold;
}

.btn:not(:disabled):not(.disabled) {
  border-left-width: 30px;
  border-right-width: 30px;
  border-radius: 30px;
  font-weight: bold;
}

.button1 {
  font-weight: bold;
  text-decoration: none;
  margin-right: 20px;
}

.button2 {
  font-weight: bold;
}