首先把下面的CSS丢到你的主题style.css样式文件内。圆角值修改下边的第三行即可。默认8px

/*宇宙超级无敌美化框*/
#zm_mhz,#zm_xgh,#zm_tkzj,#zm_xyz,#zm_gll,#zm_xty,#zm_yyz,#zm_szh,#zm_wbk {
	/*圆角值,在此定义*/
	border - radius: 8px;
}
/*迷幻紫*/
#zm_mhz {
	color: #555555;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
	/*border-radius: 10px;*/
	box - shadow: 6px 0 12px - 5px rgb(190, 196, 252),
	-6px 0 12px - 5px rgb(189, 196, 252);
	background - color: #8EC5FC;
	background - image: linear - gradient(62deg, #8EC5FC 0 % , #E0C3FC 100 % );
	background - image: -webkit - linear - gradient(62deg, #8EC5FC 0 % , #E0C3FC 100 % );
}
/*西瓜红*/
#zm_xgh {
	color: #555555;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
	/*border-radius: 10px;*/
	box - shadow: 6px 0 12px - 5px rgb(255, 176, 172),
	-6px 0 12px - 5px rgb(255, 161, 174);
	background - color: #ff9a8b66;
	background - image: linear - gradient(220deg, #FF9A8B 0 % , #ff6a8838 55 % , #FF99AC 100 % );
	background - image: -webkit - linear - gradient(220deg, #ff9a8b7a 0 % , #ff6a88ab 55 % , #ff99ac82 100 % );
}
/*华为P30 天空之境*/
#zm_tkzj {
	color: #555555;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
	/*border-radius: 10px;*/
	box - shadow: 6px 0 12px - 5px rgb(253, 223, 234),
	-6px 0 12px - 5px rgb(215, 240, 243);
	background - color: #FFDEE9;
	background - image: linear - gradient(0deg, #ffdee9c4 0 % , #b5fffc8f 100 % );
	background - image: -webkit - linear - gradient(0deg, #ffdee9c4 0 % , #b5fffc8f 100 % );
}
/*小宇宙*/
#zm_xyz {
	color: #eeeeee;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
	/*border-radius: 10px;*/
	box - shadow: 6px 0 12px - 5px rgb(12, 85, 141),
	-6px 0 12px - 5px rgba(10, 58, 93, 0);
	background - image: radial - gradient(circle 263px at 100.2 % 3 % , rgba(12, 85, 141, 1) 31.1 % , rgba(205, 181, 93, 1) 36.4 % , rgba(244, 102, 90, 1) 50.9 % , rgba(199, 206, 187, 1) 60.7 % , rgba(249, 140, 69, 1) 72.5 % , rgba(12, 73, 116, 1) 72.6 % );
}
/*橄榄绿*/
#zm_gll {
	color: #eeeeee;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
	/*border-radius: 10px;*/
	box - shadow: 6px 0 12px - 5px rgb(68, 110, 92),
	-6px 0 12px - 5px rgb(204, 212, 163);
	background - image: linear - gradient(102deg, rgba(68, 110, 92, 1) 17.4 % , rgba(107, 156, 120, 1) 49.3 % , rgba(154, 183, 130, 1) 83.4 % , rgba(247, 237, 191, 1) 110.3 % );
}
/*小太阳*/
#zm_xty {
	color: #ffffff;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
	/*border-radius: 10px; */
	box - shadow: 6px 0 12px - 5px rgb(253, 223, 234),
	-6px 0 12px - 5px rgb(215, 240, 243);
	background - image: radial - gradient(circle farthest - corner at - 8.9 % 51.2 % , rgba(255, 124, 0, 1) 0 % , rgba(255, 124, 0, 1) 15.9 % , rgba(255, 163, 77, 1) 15.9 % , rgba(255, 163, 77, 1) 24.4 % , rgba(19, 30, 37, 1) 24.5 % , rgba(19, 30, 37, 1) 66 % );
}
/*优雅紫*/
#zm_yyz {
	color: #ffffff;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
	/*border-radius: 10px;*/
	box - shadow: 6px 0 12px - 5px rgb(175, 160, 208),
	-6px 0 12px - 5px rgba(177, 161, 207, 0);
	background - image: radial - gradient(circle farthest - corner at 10 % 20 % , rgba(95, 117, 227, 1) 0 % , rgba(188, 167, 205, 1) 90 % );
}
/*深邃黑*/
#zm_szh {
	color: #c7c7c7;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
	/*border-radius: 5px;*/
	box - shadow: 6px 0 12px - 5px rgb(155, 170, 185),
	-6px 0 12px - 5px rgba(177, 161, 207, 0);
	background - image: radial - gradient(circle farthest - corner at 10 % 20 % , rgba(0, 0, 0, 1) 0 % , rgba(64, 64, 64, 1) 90.2 % );
}
/*无边框*/
#zm_wbk {
	color: #000000;
	overflow: hidden;
	margin: 10px 0;
	padding: 15px 15px 15px 35px;
}#zm_xyz a,
#zm_gll a {
	color: #eeeeee;
}#zm_szh a {
	color: #c7c7c7;
}#zm_xty a,
#zm_yyz a {
	color: #ffffff;
}

然后把下面的代码放到你主题的函数文件functions.php内

/*文本编辑自定义快捷标签按钮*/
 add_action('after_wp_tiny_mce', 'bolo_after_wp_tiny_mce');
 function bolo_after_wp_tiny_mce($mce_settings) {
 ?>
 <script type="text/javascript"> 
 QTags.addButton( 'z_mhz', '迷幻紫', '<div id="zm_mhz">迷幻紫</div>', "" );
 QTags.addButton( 'z_xgh', '西瓜红', '<div id="zm_xgh">西瓜红</div>', "" );
 QTags.addButton( 'z_tkzj', '天空之境', '<div id="zm_tkzj">天空之境</div>', "" );
 QTags.addButton( 'z_xyz', '小宇宙', '<div id="zm_xyz">小宇宙</div>', "" );
 QTags.addButton( 'z_gll', '橄榄绿', '<div id="zm_gll">橄榄绿</div>', "" );
 QTags.addButton( 'z_xty', '小太阳', '<div id="zm_xty">小太阳</div>', "" );
 QTags.addButton( 'z_yyz', '优雅紫', '<div id="zm_yyz">优雅紫</div>', "" );
 QTags.addButton( 'z_szh', '深邃黑', '<div id="zm_szh">深邃黑</div>', "" );
 QTags.addButton( 'z_wbk', '无边框', '<div id="zm_wbk">无边框</div>', "" ); 
 function bolo_QTnextpage_arg1() {
 }
 </script>
 <?php
 }
 /*文本编辑自定义快捷标签按钮*/

如图，WordPress后台文章编辑器 文本选项插入相应文本框即可。可返回可视化编辑操作。如换行不生效可检查div嵌套关系