fix header style in articles
diff --git a/_scss/_pages.doc.scss b/_scss/_pages.doc.scss
new file mode 100644
index 0000000..04d2064
--- /dev/null
+++ b/_scss/_pages.doc.scss
@@ -0,0 +1,12 @@
+#ec-doc-main .ec-doc-tutorial .page-description {
+    h4 {
+        margin: 1.33em 0;
+        padding: 0;
+        font-weight: bold;
+    }
+    h5 {
+        margin: 1.67em 0;
+        padding: 0;
+        font-weight: bold;
+    }
+}
\ No newline at end of file
diff --git a/_scss/_pages.examples.charts.scss b/_scss/_pages.examples.charts.scss
deleted file mode 100644
index 6c9bf28..0000000
--- a/_scss/_pages.examples.charts.scss
+++ /dev/null
@@ -1,132 +0,0 @@
-$chart-list-title-height: 90px;
-
-#explore-container {
-    position: relative;
-    margin-left: $chart-nav-width;
-    z-index: 10;
-    background-color: $clr-lightest;
-}
-
-#chart-demo {
-    position: absolute;
-    top: 50px;
-    left: $chart-nav-width;
-    right: 0;
-    bottom: 0;
-    overflow: hidden;
-
-    iframe {
-        width: 100%;
-        height: 100%;
-        border: none;
-    }
-}
-
-.chart-list-panel {
-    padding: 30px 15px 30px 15px;
-
-    h3 {
-        margin-bottom: 20px;
-        border-bottom: 1px solid #ccc;
-        padding-bottom: 5px;
-        margin-top: 50px;
-    }
-
-    .chart {
-        width: 100%;
-        max-width: 350px;
-        margin: 0 auto;
-        margin-bottom: 30px;
-
-        border-radius: 4px;
-        background: #fff;
-        -webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
-           -moz-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
-                box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
-
-
-        .chart-link {
-            position: relative;
-            display: block;
-
-            .chart-area {
-                width: 100%;
-                height: 100%;
-                padding: 8px;
-            }
-
-            .chart-title {
-                color: $clr-primary;
-                overflow: hidden;
-                text-overflow: ellipsis;
-                white-space: nowrap;
-
-                padding: 10px 10px 2px 10px;
-                margin: 0;
-                font-weight: normal;
-
-                font-size: 16px;
-            }
-        }
-
-        .chart-info {
-            padding: 5px 0;
-
-            font-weight: bold;
-
-            .chart-icon {
-                float: right;
-
-                .chart-delete {
-                    display: none;
-
-                    transition: 1s;
-                }
-            }
-        }
-
-        &:hover .chart-info .chart-icon .chart-delete {
-            display: block;
-
-            text-decoration: none;
-        }
-    }
-}
-
-@media (max-width: 768px) {
-    .chart-list-panel .chart .chart-link {
-        .chart-hover {
-            opacity: 1;
-            position: static;
-            color: $clr-dark;
-            margin-top: 0;
-            height: auto;
-
-            .chart-title {
-                border-top: none;
-                color: $clr-contrast;
-                margin-top: 20px;
-                margin-bottom: 0;
-            }
-
-            .chart-subtitle {
-                display: none;
-            }
-
-            .chart-title:before, .chart-subtitle:after {
-                display: none;
-            }
-        }
-
-        &:hover .chart-hover-bg {
-            display: none;
-        }
-    }
-
-    #explore-container {
-        margin-left: 0;
-    }
-    #chart-demo {
-        left: 0;
-    }
-}
diff --git a/_scss/_pages.examples.nav.scss b/_scss/_pages.examples.nav.scss
deleted file mode 100644
index 05aa673..0000000
--- a/_scss/_pages.examples.nav.scss
+++ /dev/null
@@ -1,153 +0,0 @@
-$chart-nav-width: 180px;
-$chart-icon-width: 32px;
-$chart-icon-border: 1px;
-
-#left-chart-nav {
-    position: fixed;
-    top: 49px;
-    bottom: 0;
-    left: 0;
-    border-top: 1px solid $clr-primary-darker;
-
-    // padding-top: $nav-height;
-    width: $chart-nav-width;
-
-    background-color: $clr-primary;
-    overflow-y: hidden;
-    z-index: 15;
-
-    &:hover {
-        overflow-y: auto;
-    }
-
-    ul {
-        padding: 0;
-    }
-
-        li {
-            height: 54px;
-            transition: 0.5s;
-            padding: 0;
-
-            a {
-                display: block;
-                padding: 10px 15px;
-                color: #ccc;
-                position: relative;
-                display: block;
-                transition: 0.5s;
-
-                .chart-name {
-                    display: inline-block;
-                    position: relative;
-                    top: -12px;
-                    margin-left: 10px;
-                }
-
-                .chart-icon {
-                    content: '';
-                    display: inline-block;
-                    width: $chart-icon-width;
-                    height: $chart-icon-width;
-                    background-image: url('../images/chart-icon.png');
-                    background-size: $chart-icon-width;
-                    background-repeat: no-repeat;
-                    border-radius: 50%;
-                    border: $chart-icon-border solid $clr-light;
-                }
-            }
-
-            &.active {
-                background-color: $clr-contrast;
-
-                a {
-                    color: $clr-lightest;
-                }
-
-                .chart-icon {
-                    border-color: $clr-lightest;
-                }
-            }
-
-            &:hover {
-                background-color: $clr-primary-dark;
-
-                &.active {
-                    background-color: $clr-contrast;
-                }
-            }
-        }
-}
-
-@media (max-width: 768px) {
-    #left-chart-nav {
-        display: none;
-    }
-}
-
-#nav-mask {
-    display: none;
-    position: fixed;
-    top: 50px;
-    left: 155px;
-    bottom: 0;
-    right: 0;
-    width: 100%;
-    height: 100%;
-    background: rgba(0, 0, 0, .3);
-    z-index: 12;
-}
-#nav-layer {
-    display: none;
-    position: fixed;
-    width: 620px;
-    max-height: 350px;
-    left: $chart-nav-width;
-    top: 200px;
-    z-index: 15;
-    background-color: #fff;
-    overflow-y: scroll;
-    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
-
-    .chart-list {
-        @include clearfix;
-        width: 100%;
-        clear: both;
-        padding: 10px;
-        box-sizing: border-box;
-    }
-    li {
-        float: left;
-        width: 180px;
-        margin: 10px 10px;
-        padding: 5px;
-        // border-radius: 10px;
-        // border: 1px solid rgba(0, 0, 0, .2);
-        box-shadow: 0 0 1px rgba(0, 0, 0, .3);
-        transition: box-shadow 0.5s ease-out;
-        &:hover {
-            box-shadow: 0 0 20px rgba(0, 0, 0, .3);
-        }
-    }
-    img {
-        width: 100%;
-        height: 100%;
-    }
-}
-
-
-
-// icon sprites
-$chart-types: 'line', 'bar', 'scatter', 'pie', 'radar', 'funnel', 'gauge', 'map',
-    'graph', 'treemap', 'parallel', 'sankey', 'candlestick', 'boxplot', 'heatmap',
-    'pictorialBar', 'themeRiver', 'calendar', 'custom', 'sunburst', 'gl', 'tree';
-$chart-position: 0, 1, 2, 4, 5, 10, 9, 8, 7, 15, 16, 17, 3, 18, 11, 24, 25, 26, 27, 28, 29, 14;
-
-@each $type in $chart-types {
-    $i: index($chart-types, $type);
-    $pos: nth($chart-position, $i);
-    #left-chart-nav-#{$type} .chart-icon {
-        background-position-x: - $chart-icon-border;
-        background-position-y: - $chart-icon-border - $pos * $chart-icon-width;
-    }
-}
diff --git a/_scss/_pages.examples.next.scss b/_scss/_pages.examples.scss
similarity index 100%
rename from _scss/_pages.examples.next.scss
rename to _scss/_pages.examples.scss
diff --git a/_scss/main.scss b/_scss/main.scss
index 8e14125..36a8310 100644
--- a/_scss/main.scss
+++ b/_scss/main.scss
@@ -96,9 +96,8 @@
 // styles only used in certain pages like index or examples
 @import 'pages.index';
 @import 'pages.index.feature';
-// @import 'pages.examples.nav';
-// @import 'pages.examples.charts';
-@import 'pages.examples.next';
+@import 'pages.examples';
+@import 'pages.doc';
 
 @import 'components.reset';
 @import 'pages.download';