pre {
    padding: 6px 10px;
    border: 1px solid #ddd;
    background-color: #f8f8f8;
    border-radius: 3px;
    margin-top: 0.5rem;
}

pre code {
    margin: 0;
    padding: 0;
    border: none;
    background-color: transparent;
    border-radius: 0;
}

.blockly {
    margin-top: 0.4rem;
    margin-bottom: 1.0rem;
}

hr {
    margin: 2.2rem 0 1.2rem 0;
}

.hr-subtitle {
    margin-top: 1.9rem;
}

.section-author {
    text-transform: uppercase;
    font-weight: 100;
}

audio {
    margin: 0.2rem 0 0.5rem 0;
}

.title {
    padding: 1.25rem 0 1rem 0;
    margin-left: -0.3rem;
}

.subtitle {
    font-size: 3rem;
    font-weight: 500;
    margin-top: -1.4rem;
    margin-left: -0.15rem;
}

.navigation {
    font-size: 1.2rem;
    margin-top: 0.2rem;
}

p {
    margin-bottom: 0.6rem;
}

.img-fluid, .youtube {
    margin-top: 0.9rem;
}

input[type="range"] {
    width: 220px;
    display: block;
    margin-bottom: 5px;
}

.led-sim-label {
    display: block;
    text-align: center;
    font-size: 1.3rem;
    font-weight: 400;
}