add document

docs/pages/background-1.md

@@ -0,0 +1 @@
+# 1.md

docs/pages/foreground-1.md

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+# 1.md

docs/styles/website.css

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+.gitbook-link {
+  display: none !important;
+}
+.book.font-family-0 {
+  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif !important;
+}
+
+.body-inner .i18n {
+  position: absolute;
+  right: 140px;
+  top: 0;
+  height: 50px;
+  line-height: 50px;
+  padding: 0 10px;
+  color: #ccc;
+  font-size: 14px;
+  display: inline-block;
+}
+
+.body-inner .i18n:hover {
+  color: #999;
+}