body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #333333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.introduction {
    margin-bottom: 40px;
}

.introduction h1 {
    font-size: 36px;
    color: #00ab66;
    border-bottom: 4px solid #00ab66;
    display: inline-block;
    padding-bottom: 10px;
}

.introduction p {
    font-size: 16px;
    line-height: 1.5;
}

.modules h2 {
    font-size: 24px;
    margin-bottom: 10px;
}

.modules p {
    font-size: 16px;
    margin-bottom: 20px;
}

.modules-list {
    list-style: none;
    padding: 0;
}

.modules-list li {
    font-size: 16px;
    margin-bottom: 10px;
    position: relative;
    padding-left: 25px;
}

.modules-list li::before {
    content: '✔';
    color: #00ab66;
    position: absolute;
    left: 0;
    top: 0;
}