/*画像の下の余白をなくす*/
.wp-block-image {
  margin-bottom: 2px !important; /* wp-block-image クラスを持つ要素の下のマージンを2ピクセルにする */
}
/* ここにCSSコードを追加

例:
.example {
    color: red;
}

CSS の知識に磨きをかけるためにご覧ください。
http://www.w3schools.com/css/css_syntax.asp

コメント終わり */ 
/* 見出しボックスのラベルを太字に */
.caption-box-label-text {
  font-weight: bold;
}


/* 左右が透明中央がテーマカラーの水色 */
.wp-block-separator.has-alpha-channel-opacity {
	border: none;/* デフォルトの境界線を非表示にする */
	height: 2px;
	background-image: linear-gradient(to right, transparent 0%, #8DADD7 50%, transparent 100%);
}
/*image-pixelでドット拡大2倍*/
.image-pixel {
	image-rendering: pixelated;
}
details.wp-block-details.is-style-update-history {
	background-color: #11F2E6;
	border: 2px solid #76DAB6;
	border-radius: 6px;
	overflow: hidden;
	max-height: 46px;
	position: relative;
}
details.wp-block-details.is-style-update-history[open] {
	max-height: none;
	background-color: #E0F6EE !important;
}
details.wp-block-details.is-style-update-history summary {
	background-color: #76DAB6;
	font-size: 18px;
	padding: 3px 10px;
	cursor: pointer;
	list-style: none;
	display: flex;
	height: 46px;
	color: white;
	align-items: center;
	transition: background-color 0.3s ease;
	position: relative;
}
/* フォーカス時の帯の色 */
details.wp-block-details.is-style-update-history summary:focus,
details.wp-block-details.is-style-update-history summary:hover,
details.wp-block-details.is-style-update-history[open] summary:focus,
details.wp-block-details.is-style-update-history[open] summary:hover {
	background-color: #A2E5CC;
}
/* 展開時の帯の色を明示的に設定 */
details.wp-block-details.is-style-update-history[open] summary {
	background-color: #76DAB6;
}
/* 展開前の記号 */
details.wp-block-details.is-style-update-history summary::before {
	content: "▶";
	margin-right: 5px;
}
/* 展開後の記号 */
details.wp-block-details.is-style-update-history[open] summary::before {
	content: "▼";
}
details.wp-block-details.is-style-update-history p {
	font-size: 14px;
	padding: 20px 10px 20px 30px;
}