Tweak theme

and upgrade vuepress to beta.17

docs/.vuepress/styles/index.scss

@@ -2,11 +2,16 @@
   --c-brand: #407ce8;
   --c-brand-light: #2e73ea;
   --c-bg-light: rgba(95, 101, 106, 0.1);
+  --c-badge-tip: #44c98d;
 
   --x-nav-text-hover: #0a51bd;
 }
 
 html.dark {
+  --c-bg: #262a31;
+  --c-bg-light: #31353e;
+  --c-bg-lighter: #3a4049;
+
   --c-brand: #407ce8;
   --c-brand-light: #2e73ea;
   --c-warning-bg: rgba(185, 174, 119, 0.3);
@@ -16,10 +21,25 @@ html.dark {
   --c-danger-title: #b40505;
   --c-danger-bg: rgba(72, 56, 57, 0.4);
   --c-danger-text: #c0bebe;
+  --c-danger-text-accent: var(--c-text-accent);
 
   --c-bg-light: rgba(255, 255, 255, 0.1);
 
   --x-nav-text-hover: #7ca6f2;
+
+  .badge.tip > a {
+    color: #305bac;
+    & > span > svg.icon.outbound {
+      color: #7d57b0;
+    }
+  }
+}
+
+.badge.tip > a {
+  color: #3c71c0;
+  & > span > svg.icon.outbound {
+    color: #ad74e1;
+  }
 }
 
 blockquote {