del {
  position: relative;
  text-decoration: none;
}

del::after {
  content: "";
  border-bottom: 6px solid red;
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
}

.reveal pre,
.reveal code {
  border-radius: 15px;
}
.reveal pre code {
  max-height: 600px;
}

.reveal .bloc {
  border: 2px solid #ccc;
  border-radius: 15px;
  box-shadow: 10px 10px 45px 0px rgba(0, 0, 0, 0.75);
  padding: 15px;
}

.reveal div._jsPlumb_overlay {
  font-size: 20px;
  line-height: 20px;
  border: 1px solid #346789;
  border-radius: 6px;
  opacity: 0.9;
  background-color: white;
  padding: 5px;
}

.reveal .slides section .visible .fragment.wrong {
  opacity: 1;
}
.reveal .slides section .visible .fragment.visible.wrong {
  text-decoration: line-through;
}