首先把下面的CSS丢到你的主题style.css样式文件内
/*WordPress文章页面新增彩色渐变框*/

#smcos_mhz,#smcos_xgh,#smcos_tkzj,#smcos_xyz,#smcos_gll ,#smcos_xty,#smcos_yyz,#smcos_szh,#smcos_wbk{

/*圆角值,在此定义*/

border-radius: 8px;

}

/*样式-迷幻紫*/

#smcos_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%);

}

/*样式-西瓜红*/

#smcos_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%);

}

/*样式-天空之境*/

#smcos_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%);

}

/*样式-小宇宙*/

#smcos_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% );

}

/*样式-橄榄绿*/

#smcos_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% );

}

/*样式-小太阳*/

#smcos_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% );

}

/*样式-优雅紫*/

#smcos_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% );

}

/*样式-深邃黑*/

#smcos_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% );

}

/*样式-无边框*/

#smcos_wbk {

color: #000000;

overflow: hidden;

margin: 10px 0;

padding: 15px 15px 15px 35px;

}

#smcos_xyz a , #smcos_gll a{

color: #eeeeee;

}

#smcos_szh a{

color: #c7c7c7;

}

#smcos_xty a, #smcos_yyz a{

color: #ffffff;

}
然后把下面的代码放到你主题的函数文件functions.php
/*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="smcos_mhz">迷幻紫</div>', "" );
 QTags.addButton( 'z_xgh', '西瓜红', '<div id="smcos_xgh">西瓜红</div>', "" );
 QTags.addButton( 'z_tkzj', '天空之境', '<div id="smcos_tkzj">天空之境</div>', "" );
 QTags.addButton( 'z_xyz', '小宇宙', '<div id="smcos_xyz">小宇宙</div>', "" );
 QTags.addButton( 'z_gll', '橄榄绿', '<div id="smcos_gll">橄榄绿</div>', "" );
 QTags.addButton( 'z_xty', '小太阳', '<div id="smcos_xty">小太阳</div>', "" );
 QTags.addButton( 'z_yyz', '优雅紫', '<div id="smcos_yyz">优雅紫</div>', "" );
 QTags.addButton( 'z_szh', '深邃黑', '<div id="smcos_szh">深邃黑</div>', "" );
 QTags.addButton( 'z_wbk', '无边框', '<div id="smcos_wbk">无边框</div>', "" ); 
 function bolo_QTnextpage_arg1() {
 }
 </script>
 <?php
 }

效果预览:

迷幻紫
西瓜红
天空之境
小宇宙
橄榄绿
小太阳
优雅紫
深邃黑
无边框