- use visible box-shadowing

- add translation for ZH
- light/darkmode switcher

assets/cn.svg

@@ -0,0 +1,9 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 900 600">
+  <rect width="900" height="600" fill="#EE1C25"/>
+  <path id="star" d="M0,-1 L0.225,-0.309 L0.951,-0.309 L0.363,0.118 L0.588,0.809 L0,0.382 L-0.588,0.809 L-0.363,0.118 L-0.951,-0.309 L-0.225,-0.309 Z" fill="#FFDE00"/>
+  <use href="#star" transform="translate(150,150) scale(90)"/>
+  <use href="#star" transform="translate(300,60) scale(30)"/>
+  <use href="#star" transform="translate(360,120) scale(30)"/>
+  <use href="#star" transform="translate(360,210) scale(30)"/>
+  <use href="#star" transform="translate(300,270) scale(30)"/>
+</svg>