.page-template-no-sidebars-php figure.wp-block-image img  {
    max-width: 100%;
    height: auto;
}
.page-template-no-sidebars-php .wp-block-embed__wrapper {
    position: relative;
    overflow: hidden;
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio (divide 9 by 16 = 0.5625) */
}
.page-template-no-sidebars-php .wp-block-embed__wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
}