body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0 1rem;
    background: #f8f9fa;
    color: #222;
}

h1 {
    text-align: center;
    margin-top: 1.5rem;
}

section {
    margin: 2rem 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    padding: 1.5rem;
}

.grid-demo {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.grid-item {
    background: #e3eafc;
    border-radius: 6px;
    padding: 1rem;
    text-align: center;
}

.grid-item img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.flex-demo {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
    align-items: center;
    justify-content: center;
}

.flex-item {
    background: #ffe5b4;
    border-radius: 6px;
    padding: 1rem;
    flex: 1 1 220px;
    min-width: 220px;
    max-width: 350px;
    text-align: center;
}

.flex-item img {
    width: 100%;
    height: 100px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.responsive-img-demo img {
    width: 100%;
    max-width: 600px;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

@media (max-width: 600px) {
    section {
        padding: 1rem;
    }
    h1 {
        font-size: 1.5rem;
    }
}