style: Add blockquote style

app/static/css/global.css

@@ -78,6 +78,12 @@ section h2 {
   color: var(--text-light);
   padding-bottom: 2px;
 }
+section blockquote {
+  margin: 0 0 10px 0;
+  border-left: 3px solid var(--border);
+  background: var(--background);
+  padding-left: 15px;
+}
 button,
 .button,
 input[type="button"],

app/static/css/themes/FK_dark_theme.css

@@ -130,6 +130,11 @@ table.codehilitetable {
     --background: #263238;
 }
 
+blockquote {
+    --border: rgba(255, 255, 255, .3);
+    --background: transparent;
+}
+
 div.editor-toolbar, div.CodeMirror {
     --border: #404040;
     --background-light: #404040;

app/static/css/themes/Tituya_v43_theme.css

@@ -145,6 +145,11 @@ table.thread.topcomment {
     border: 1px solid #c0c0c0;
 }
 
+blockquote {
+    --border: rgba(236, 36, 36, .7);
+    --background: transparent;
+}
+
 div.editor-toolbar {
     --border: #aaa2a2;
     --background-light: #c0c0c0;

app/static/css/themes/default_theme.css

@@ -37,6 +37,11 @@ table th {
     --border: #ddd;
 }
 
+blockquote {
+    --border: rgba(0, 0, 0, .3);
+    --background: transparent;
+}
+
 .form {
     --background: #fff;
     --text: #000;

app/static/less/global.less

@@ -77,6 +77,13 @@ section {
         color: var(--text-light);
         padding-bottom: 2px;
     }
+
+    blockquote {
+        margin: 0 0 10px 0;
+        border-left: 3px solid var(--border);
+        background: var(--background);
+        padding-left: 15px;
+    }
 }
 
 /* Buttons */