.map-container {
    max-width: 800px;
    height: 400px;
    margin: 0 auto;
    position: relative;
}

.map-container iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

@media (max-width: 768px) {
    .map-container {
        width: 100%;
        height: 0;
        padding-bottom: 56.25%;
    }

    .map-container iframe {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
}