💡 Update style

styles/common.css

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+/**
+ * Common styles
+ */
+
+html, body {
+    margin: 0;
+    padding: 0;
+    height: 100%;
+
+    font: 16px 'Source Sans Pro', sans-serif;
+}
+
+h1 {
+    font-size: 2em;
+    font-weight: bold;
+}
+
+h2 {
+    font-size: 1.6em;
+    font-weight: bold;
+}
+
+h3 {
+    font-size: 1.2em;
+    font-weight: normal;
+}
+
+a {
+    color: inherit;
+}
+
+*:before, *:after, * {
+    -webkit-box-sizing: border-box;
+    -moz-box-sizing: border-box;
+    box-sizing: border-box;
+}

styles/subsite.css

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+/**
+ * Subsite styles
+ * (hosted demos, ...)
+ */
+
+/**
+ * Split view
+ * (sidebar + content)
+ */
+
+.split {
+    display: flex;
+}
+
+.split aside {
+    width: 350px;
+    flex-shrink: 4;
+    padding: 8px 16px;
+    color: white;
+    background: #F44336;
+}
+
+.split aside header {
+    margin: -8px -16px 0 -16px;
+    background: #D32F2F;
+}
+
+.split aside header a {
+    padding: 8px 16px;
+    display: block;
+    text-decoration: none;
+}
+
+.split aside header:hover {
+    background: #C62828;
+}
+
+.split aside header img {
+    width: 2.5em;
+    float: left;
+    margin-right: 0.5em;
+
+    border-radius: 100%;
+    border: 2px solid white;
+}
+
+.split aside header span {
+    font-weight: bold;
+}
+
+.split aside header:after {
+    content: '';
+    display: table;
+    clear: both;
+}
+
+.split aside h1 + h3 {
+    margin-top: -1.3em;
+}
+
+.split #content {
+    width: calc(100% - 350px);
+    flex-shrink: 1;
+}