.bd-placeholder-img {
  font-size: 1.125rem;
  text-anchor: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
}

@media (min-width: 768px) {
  .bd-placeholder-img-lg {
    font-size: 3.5rem;
  }
}

.b-example-divider {
  height: 3rem;
  background-color: rgba(0, 0, 0, 0.1);
  border: solid rgba(0, 0, 0, 0.15);
  border-width: 1px 0;
  box-shadow: inset 0 0.5em 1.5em rgba(0, 0, 0, 0.1),
    inset 0 0.125em 0.5em rgba(0, 0, 0, 0.15);
}

.bi {
  vertical-align: -0.125em;
  fill: currentColor;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  margin-bottom: 1rem;
  font-size: 2rem;
  color: #fff;
  border-radius: 0.75rem;
}

.icon-link {
  display: inline-flex;
  align-items: center;
}
.icon-link > .bi {
  margin-top: 0.125rem;
  margin-left: 0.125rem;
  transition: transform 0.25s ease-in-out;
  fill: currentColor;
}
.icon-link:hover > .bi {
  transform: translate(0.25rem);
}

.icon-square {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  font-size: 1.5rem;
  border-radius: 0.75rem;
}

.rounded-4 {
  border-radius: 0.5rem;
}
.rounded-5 {
  border-radius: 1rem;
}

.text-shadow-1 {
  text-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.25);
}
.text-shadow-2 {
  text-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.25);
}
.text-shadow-3 {
  text-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.25);
}

.card-cover {
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
}

a:link,
a:visited,
a:active {
  color: white;
  text-decoration: none;
}

a:hover {
  color: yellow;
  text-decoration: none;
}

.titolo-avatar {
  display: inline-block;
}

.avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  position: relative;
  top: -0.5rem;
}

.titolo {
  display: inline-block;
  margin-left: 1rem;
}

.materia {
    width: 20vw;
    height: 10vw;
}