How to make Google Map responsive view

<style>
    .google-maps {
        position: relative;
        padding-bottom: 75%; // This is the aspect ratio
        height: 0;
        overflow: hidden;
    }
    .google-maps iframe {
        position: absolute;
        top: 0;
        left: 0;
        width: 100% !important;
        height: 100% !important;
    }
</style>

<div class="google-maps">

GOOGLE MAP CODE

</div>