body { width: 100%; background: RGB (251, 127, 80)!important; position: relative; }
body, html { margin: 0; padding: 0; }
.iframe-custom { width: 100%; height: 100vh; border: 0; overflow-x: hidden; }

@media (max-width: 600px) {
    .iframe-custom { margin: 0px; }
}