代码块高亮颜色

修改\source\css\_common\components\highlight\theme.styl

if $highlight_theme == "normal"
  $highlight-background   = #1b2426
  $highlight-current-line = #efefef
  $highlight-selection    = #d6d6d6
  $highlight-foreground   = #b9bdb6
  $highlight-comment      = #8e908c
  $highlight-red          = #c82829
  $highlight-orange       = #f5871f
  $highlight-yellow       = #eab700
  $highlight-green        = #009900
  $highlight-aqua         = #5ce638
  $highlight-blue         = #4271ae
  $highlight-purple       = #8959a8
  $highlight-gutter       = {
    color: #869194,
    bg-color: #373b41
  }

你是哪个子主题就选哪个if $highlight_theme == "normal"

代码块 添加阴影和圆角

修改\source\css\_common\components\highlight\highlight.styl

.highlight {
  @extend $code-block;
  // Read values from NexT config and set they as local variables to use as string variables (in any CSS section). 
  hexo-config('codeblock.border_radius') is a 'unit' ? (cbradius = unit(hexo-config('codeblock.border_radius'), px)) : (cbradius = 1px) 
  //border-radius: cbradius;
+  border-radius: 8px; //圆角
+  box-shadow: 0 0 10px #212529, 0 0 5px #212529; /*阴影颜色*/

其他代码块的样式，你可以在\theme.styl文件中进行修改