JezK

Edit File: wp-embed-template.css

html, body {
	padding: 0;
	margin: 0;
}

body {
	font-family: sans-serif;
}

/* Text meant only for screen readers */
.screen-reader-text {
	border: 0;
	clip-path: inset(50%);
	height: 1px;
	margin: -1px;
	overflow: hidden;
	padding: 0;
	position: absolute;
	width: 1px;
	/* Many screen reader and browser combinations announce broken words as they would appear visually. */
	word-wrap: normal !important;
	word-break: normal !important;
}

/* Dashicons */
.dashicons {
	display: inline-block;
	width: 20px;
	height: 20px;
	background-color: transparent;
	background-repeat: no-repeat;
	background-size: 20px;
	background-position: center;
	transition: background .1s ease-in;
	position: relative;
	top: 5px;
}

.dashicons-no {
	background-image: url("data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2020%2020%27%3E%3Cpath%20d%3D%27M15.55%2013.7l-2.19%202.06-3.42-3.65-3.64%203.43-2.06-2.18%203.64-3.43-3.42-3.64%202.18-2.06%203.43%203.64%203.64-3.42%202.05%202.18-3.64%203.43z%27%20fill%3D%27%23fff%27%2F%3E%3C%2Fsvg%3E");
}

.dashicons-admin-comments {
	background-image: url("data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2020%2020%27%3E%3Cpath%20d%3D%27M5%202h9q.82%200%201.41.59T16%204v7q0%20.82-.59%201.41T14%2013h-2l-5%205v-5H5q-.82%200-1.41-.59T3%2011V4q0-.82.59-1.41T5%202z%27%20fill%3D%27%23646970%27%2F%3E%3C%2Fsvg%3E");
}

.wp-embed-comments a:hover .dashicons-admin-comments {
	background-image: url("data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2020%2020%27%3E%3Cpath%20d%3D%27M5%202h9q.82%200%201.41.59T16%204v7q0%20.82-.59%201.41T14%2013h-2l-5%205v-5H5q-.82%200-1.41-.59T3%2011V4q0-.82.59-1.41T5%202z%27%20fill%3D%27%23135e96%27%2F%3E%3C%2Fsvg%3E");
}

.dashicons-share {
	background-image: url("data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2020%2020%27%3E%3Cpath%20d%3D%27M14.5%2012q1.24%200%202.12.88T17.5%2015t-.88%202.12-2.12.88-2.12-.88T11.5%2015q0-.34.09-.69l-4.38-2.3Q6.32%2013%205%2013q-1.24%200-2.12-.88T2%2010t.88-2.12T5%207q1.3%200%202.21.99l4.38-2.3q-.09-.35-.09-.69%200-1.24.88-2.12T14.5%202t2.12.88T17.5%205t-.88%202.12T14.5%208q-1.3%200-2.21-.99l-4.38%202.3Q8%209.66%208%2010t-.09.69l4.38%202.3q.89-.99%202.21-.99z%27%20fill%3D%27%23646970%27%2F%3E%3C%2Fsvg%3E");
	display: none;
}

.js .dashicons-share {
	display: inline-block;
}

.wp-embed-share-dialog-open:hover .dashicons-share {
	background-image: url("data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2020%2020%27%3E%3Cpath%20d%3D%27M14.5%2012q1.24%200%202.12.88T17.5%2015t-.88%202.12-2.12.88-2.12-.88T11.5%2015q0-.34.09-.69l-4.38-2.3Q6.32%2013%205%2013q-1.24%200-2.12-.88T2%2010t.88-2.12T5%207q1.3%200%202.21.99l4.38-2.3q-.09-.35-.09-.69%200-1.24.88-2.12T14.5%202t2.12.88T17.5%205t-.88%202.12T14.5%208q-1.3%200-2.21-.99l-4.38%202.3Q8%209.66%208%2010t-.09.69l4.38%202.3q.89-.99%202.21-.99z%27%20fill%3D%27%23135e96%27%2F%3E%3C%2Fsvg%3E");
}

.wp-embed {
	padding: 25px;
	font-size: 14px;
	font-weight: 400;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
	line-height: 1.5;
	color: #646970;
	background: #fff;
	border: 1px solid #dcdcde;
	box-shadow: 0 1px 1px rgba(0, 0, 0, 0.05);
	/* Clearfix */
	overflow: auto;
	zoom: 1;
}

.wp-embed a {
	color: #646970;
	text-decoration: none;
}

.wp-embed a:hover {
	text-decoration: underline;
}

.wp-embed-featured-image {
	margin-bottom: 20px;
}

.wp-embed-featured-image img {
	width: 100%;
	height: auto;
	border: none;
}

.wp-embed-featured-image.square {
	float: left;
	max-width: 160px;
	margin-right: 20px;
}

.wp-embed p {
	margin: 0;
}

p.wp-embed-heading {
	margin: 0 0 15px;
	font-weight: 600;
	font-size: 22px;
	line-height: 1.3;
}

.wp-embed-heading a {
	color: #2c3338;
}

.wp-embed .wp-embed-more {
	color: #2271b1;
	text-decoration: underline;
}

.wp-embed-footer {
	display: table;
	width: 100%;
	margin-top: 30px;
}

.wp-embed-site-icon {
	position: absolute;
	top: 50%;
	left: 0;
	transform: translateY(-50%);
	height: 25px;
	width: 25px;
	border: 0;
}

.wp-embed-site-title {
	font-weight: 600;
	line-height: 1.78571428;
}

.wp-embed-site-title a {
	position: relative;
	display: inline-block;
	padding-left: 35px;
}

.wp-embed-site-title,
.wp-embed-meta {
	display: table-cell;
}

.wp-embed-meta {
	text-align: right;
	white-space: nowrap;
	vertical-align: middle;
}

.wp-embed-comments,
.wp-embed-share {
	display: inline;
}

.wp-embed-meta a:hover {
	text-decoration: none;
	color: #135e96;
}

.wp-embed-comments a {
	line-height: 1.78571428;
	display: inline-block;
}

.wp-embed-comments + .wp-embed-share {
	margin-left: 10px;
}

.wp-embed-share-dialog {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background-color: #1d2327;
	background-color: rgba(0, 0, 0, 0.9);
	color: #fff;
	opacity: 1;
	transition: opacity .25s ease-in-out;
}

.wp-embed-share-dialog.hidden {
	opacity: 0;
	visibility: hidden;
}

.wp-embed-share-dialog-open,
.wp-embed-share-dialog-close {
	margin: -8px 0 0;
	padding: 0;
	background: transparent;
	border: none;
	cursor: pointer;
	outline: none;
}

.wp-embed-share-dialog-open .dashicons,
.wp-embed-share-dialog-close .dashicons {
	padding: 4px;
}

.wp-embed-share-dialog-open .dashicons {
	top: 8px;
}

.wp-embed-share-dialog-open:focus .dashicons,
.wp-embed-share-dialog-close:focus .dashicons {
	box-shadow: 0 0 0 var(--wp-admin-border-width-focus, 1.5px) var(--wp-admin-theme-color, #3858e9);
	/* Only visible in Windows High Contrast mode */
	outline: 2px solid transparent;
	border-radius: 100%;
}

.wp-embed-share-dialog-close {
	position: absolute;
	top: 20px;
	right: 20px;
	font-size: 22px;
}

.wp-embed-share-dialog-close:hover {
	text-decoration: none;
}

.wp-embed-share-dialog-close .dashicons {
	height: 24px;
	width: 24px;
	background-size: 24px;
}

.wp-embed-share-dialog-content {
	height: 100%;
	transform-style: preserve-3d;
	overflow: hidden;
}

.wp-embed-share-dialog-text {
	margin-top: 25px;
	padding: 20px;
}

.wp-embed-share-tabs {
	margin: 0 0 20px;
	padding: 0;
	list-style: none;
}

.wp-embed-share-tab-button {
	display: inline-block;
}

.wp-embed-share-tab-button button {
	margin: 0;
	padding: 0;
	border: none;
	background: transparent;
	font-size: 16px;
	line-height: 1.3;
	color: #a7aaad;
	cursor: pointer;
	transition: color .1s ease-in;
}

.wp-embed-share-tab-button [aria-selected="true"] {
	color: #fff;
}

.wp-embed-share-tab-button button:hover {
	color: #fff;
}

.wp-embed-share-tab-button + .wp-embed-share-tab-button {
	margin: 0 0 0 10px;
	padding: 0 0 0 11px;
	border-left: 1px solid #a7aaad;
}

.wp-embed-share-tab[aria-hidden="true"] {
	display: none;
}

p.wp-embed-share-description {
	margin: 0;
	font-size: 14px;
	line-height: 1;
	font-style: italic;
	color: #a7aaad;
}

.wp-embed-share-input {
	box-sizing: border-box;
	width: 100%;
	border: none;
	height: 28px;
	margin: 0 0 10px;
	padding: 0 5px;
	font-size: 14px;
	font-weight: 400;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
	line-height: 1.5;
	resize: none;
	cursor: text;
}

textarea.wp-embed-share-input {
	height: 72px;
}

html[dir="rtl"] .wp-embed-featured-image.square {
	float: right;
	margin-right: 0;
	margin-left: 20px;
}

html[dir="rtl"] .wp-embed-site-title a {
	padding-left: 0;
	padding-right: 35px;
}

html[dir="rtl"] .wp-embed-site-icon {
	margin-right: 0;
	margin-left: 10px;
	left: auto;
	right: 0;
}

html[dir="rtl"] .wp-embed-meta {
	text-align: left;
}

html[dir="rtl"] .wp-embed-share {
	margin-left: 0;
	margin-right: 10px;
}

html[dir="rtl"] .wp-embed-share-dialog-close {
	right: auto;
	left: 20px;
}

html[dir="rtl"] .wp-embed-share-tab-button + .wp-embed-share-tab-button {
	margin: 0 10px 0 0;
	padding: 0 11px 0 0;
	border-left: none;
	border-right: 1px solid #a7aaad;
}

JezK

Edit File: wp-embed-template.css

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