/* Extra small devices (phones, 600px and down) */
 @media only screen and (max-width: 600px) { 
        .iframe-container { 
            width: 100%; 
            height: 200px; 
        } 
 }

/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {
    .iframe-container {
        width: 100%;
        height: 300px;
    }

  }

 /* Medium devices (landscape tablets, 768px and up) */
    @media only screen and (min-width: 768px) { 
            .iframe-container { 
                width: 100%; 
                height: 400px; 
            } 
    }
  
    /* Large devices (laptops/desktops, 992px and up) */
    @media only screen and (min-width: 992px) { 
            .iframe-container { 
                width: 100%; 
                height: 500px; 
            } 
    }