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;
}