.propositions {
  margin-left: 15px;
}
.proposition {
  margin-left: 15px;
}

.bloc-math {
  border: solid 1px;
  padding: 2px;
}
.enonce {
  background: lightblue;
  background: linear-gradient(to right, lightblue, #06A);
}

.invisible {
    background: linear-gradient(45deg, #eee 12.5%, #fff 12.5%, #fff 37.5%, #eee 37.5%, #eee 62.5%, #fff 62.5%, #fff 87.5%, #eee 87.5%);
    background-size: 100px 100px;
    background-position: 50px 50px;
  }

.indication {
  margin-left: 15px;
  background: #985;
  background: linear-gradient(to right, Azure, #CFF);
}
.solution {
  margin-left: 15px;
  background: #6C6;
  background: linear-gradient(to right, #f2ffe6, #0A6);
}

.commentaire {
  background: #069;
  color: #FFF;
  padding: 3px;
  margin-bottom: 15px;
  margin-right: 7px;
  box-shadow: 8px 6px #AAA;
}

.commentaire_form {
  background: #DDD;
  padding: 3px;
  margin-top: 5px;
}

.sc {
  font-variant: small-caps;
}

.niveau_1 {
  list-style-type: decimal;
}
.niveau_2 {
  list-style-type: lower-latin;
}
.niveau_3 {
  list-style-type: lower-roman;
}
.niveau_4 {
  list-style-type: lower-greek;
}