.iframe-guide {
    width: 100%;
    min-height: 100vh; /* ocupa 80% del alto visible */
    border: none;
}

/* 
@media (max-width: 768px) {
    .iframe-guide {
        transform: scale(0.8);              
        transform-origin: top left;         
        width: 125%;                       
        height: 125vh;                     
        border: none;
        overflow: hidden;
    }
} */