main {
    max-width: 720px;
    margin: 20px auto;
    padding: 20px;
    font-family: Arial, sans-serif;
    box-sizing: border-box;
}

.skills-section {
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h2 {
    font-size: 26px;
    color: #333;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 2px solid #009688;
    padding-bottom: 10px;
}

.section-icon {
    font-size: 30px;
    color: #009688;
    margin-right: 10px;
}

.content {
    margin-top: 20px;
}

.promotion-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 20px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.3s ease;
}

.promotion-item:hover {
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.promotion-icon {
    font-size: 28px;
    color: #009688;
    margin-right: 15px;
}

.promotion-item p {
    margin: 0;
    font-size: 18px;
    color: #555;
    line-height: 1.8;
}

@media (max-width: 720px) {
    main {
        padding: 15px;
    }

    .skills-section {
        padding: 15px;
    }

    h2 {
        font-size: 22px;
    }

    .promotion-item p {
        font-size: 16px;
    }

    .promotion-icon {
        font-size: 24px;
    }
}