主题：隐私提示及背景音乐

- 首页提示选择是否开启音乐
 - 网络请求 timeout=30s

static/painting/css/painting.css

@@ -76,6 +76,47 @@ html {
 
 #tab1 {
     background-image: url('../img/page1.jpg');
+    position: relative;
+}
+
+.popup {
+    position: absolute;
+    bottom: 0.5rem;
+    background: #fff;
+    padding: 1.5rem;
+    border: 1px solid #d1d1d1;
+}
+
+.popup > .notice > hr {
+    margin: 1rem 0;
+}
+
+.popup > .selection {
+    text-align: right;
+}
+
+.selection > button {
+    border: none;
+    padding: 0.75rem 1rem;
+    margin: 0.5rem 0 0 0.5rem;
+}
+
+.allow {
+    cursor: pointer;
+}
+
+.deny {
+    background-color: #059862;
+    cursor: pointer;
+    color: #fff;
+    padding: 0.5rem 0;
+    opacity: 0.8;
+}
+
+.deny:hover,
+.deny:focus {
+    opacity: 1;
+    cursor: pointer;
 }
 
 #tab2 {