body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #742525;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}

h1 {
    margin: 0;
}


.introduction {
    margin: 20px;
    padding: 10px;
    background-color: #fff;
    border-radius: 5px;
}

.concepts {
    margin: 20px;
}

.concept {
    margin-bottom: 20px;
    padding: 15px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

h2 {
    font-size: 1.8em;
    margin-bottom: 15px;
}

h3 {
    font-size: 1.5em;
    margin-bottom: 10px;
}

p {
    font-size: 1.1em;
    margin-bottom: 10px;
}

pre {
    background-color: #eee;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
}


footer {
    text-align: center;
    padding: 10px 0;
    background-color: #742525;
    color: #fff;
}

.concept h3 {
    animation: exampleAnimation 2s infinite alternate;
}

@keyframes exampleAnimation {
    0% { color: #4c97ad; }
    100% { color: #f00; }
}