diff --git a/index.css b/index.css
new file mode 100644
index 0000000..7a89a2b
--- /dev/null
+++ b/index.css
@@ -0,0 +1,160 @@
+sidebar *,
+nav * {
+    font-family: "Helvetica Neue", "Helvetica", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "WenQuanYi Micro Hei", "Arial", sans-serif;
+    margin: 0;
+    padding: 0;
+    outline: none;
+    color: #333;
+    word-break: break-all;
+    text-decoration: none;
+}
+
+.pull-left {
+    float: left;
+}
+
+nav {
+    position: fixed;
+    top: 0;
+    left: 0;
+    height: 50px;
+    display: block;
+    width: 100%;
+    background-color: #fff;
+    border-bottom: 1px solid #e5e5e5;
+    z-index: 1;
+    line-height: 50px;
+}
+
+nav img {
+    vertical-align: middle;
+    margin: 0 5px 0 10px;
+}
+
+sidebar {
+    position: fixed;
+    top: 51px;
+    left: 0;
+    width: 250px;
+    background-color: #fff;
+    border-right: 1px solid #e5e5e5;
+    font-size: 14px;
+    height: -webkit-calc(100% - 50px);
+    height: -ms-calc(100% - 50px);
+    height: -moz-calc(100% - 50px);
+    height: calc(100% - 50px);
+    overflow: auto;
+}
+
+sidebar li {
+    list-style-type: none;
+    line-height: 40px;
+}
+
+sidebar li p {
+    cursor: pointer;
+    text-indent: 10px;
+}
+
+sidebar li p a {
+    display: block;
+    font-size: 14px;
+}
+
+
+sidebar li .ico_up .ico {
+    background-position: 0 -4px;
+}
+
+.hidden ul {
+    display: none;
+}
+
+.ico {
+    background-image: url(./assets/jiantou.png);
+    width: 8px;
+    height: 4px;
+    margin-top: 18px;
+    margin-left: 10px;
+}
+
+.unchild-span {
+    width: 8px;
+    height: 4px;
+    margin-top: 18px;
+    margin-left: 10px;
+}
+
+.common-level-1 p a {
+    padding-left: 1em;
+}
+
+.common-level-2 p a {
+    padding-left: 2em;
+}
+
+.level0 {
+    background-color: #f3f3f3;
+}
+
+.level1 {
+    background-color: #eaeaea;
+}
+
+.level0 .common-level-1 {
+    background-color: #e9e9e9;
+}
+
+.level1 .common-level-2 {
+    background-color: #ddd;
+}
+
+.elem-active a {
+    background-color: #2196F3;
+    color: #fff;
+}
+
+sidebar li .ico_down .ico {
+    background-position: 0 0;
+}
+
+article {
+    position: absolute;
+    top: 60px;
+    left: 290px;
+}
+
+article .markdown-body img {
+    border: 1px solid #ededed;
+}
+
+
+::-webkit-scrollbar {
+    width: 8px;
+    height: 8px;
+}
+
+
+
+/* Track */
+
+::-webkit-scrollbar-track {
+    //-webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
+    //-webkit-border-radius: 10px;
+    //border-radius: 10px;
+    background: #fff;
+}
+
+
+
+/* Handle */
+
+::-webkit-scrollbar-thumb {
+    -webkit-border-radius: 10px;
+    border-radius: 10px;
+    background: #ccc; //-webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.5);
+}
+
+::-webkit-scrollbar-thumb:window-inactive {
+    background: #ddd;
+}
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