Add header files

themes/gokarna/layouts/partials/header.html

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+<div class="container wrapper">
+    <div class="header header-dark" id="header-sroll">
+        <nav class="header-nav">
+
+            <div class="avatar">
+                <a href=".Site.BaseURL">
+                    <img src=".Site.Params.Avatar" alt=" Avatar" />
+                </a>
+            </div>
+
+            <div class="nav-title">
+                <a class="nav-brand" href="https://shantanugoel.com">Title title</a>
+            </div>
+
+        </nav>
+    </div>
+</div>

themes/gokarna/static/css/main.css

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+html {
+  font-family: open sans, helvetica neue, Helvetica, Arial, sans-serif;
+}
+
+.container {
+  height: 800px;
+}
+
+.header-light {
+  background-color: #bbb;
+  color: black;
+}
+
+.header-dark {
+  background-color: #1b1c1d;
+  color: white;
+}
+
+.header {
+  position: fixed;
+  height: 100px;
+  left: 0;
+  top: 0;
+  width: 100%;
+  -ms-transition: all 0.5s ease-out;
+  -moz-transition: all 0.5s ease-out;
+  -webkit-transition: all 0.5s ease-out;
+  -o-transition: all 0.5s ease-out;
+  transition: all 0.5s ease-out;
+}
+
+.header.small {
+  height: 70px;
+}
+
+/* #header-sroll h1 {
+    font-size: 30px;
+    font-family: Arial;
+    text-align: center;
+    line-height: 50px;
+     -ms-transition:    all 0.2s ease-out;
+    -moz-transition:    all 0.2s ease-out;
+    -webkit-transition: all 0.2s ease-out;
+    -o-transition:      all 0.2s ease-out;
+    transition:         all 0.2s ease-out;
+}
+#header-sroll.small h1{
+    height: 70px;
+    line-height: 35px;
+    font-size: 25px;
+}
+ */
+
+.header a {
+  text-decoration: none;
+  color: inherit;
+}
+
+.header .header-nav {
+  height: 64px;
+  margin-top: 18px;
+  -ms-transition: all 0.5s ease-out;
+  -moz-transition: all 0.5s ease-out;
+  -webkit-transition: all 0.5s ease-out;
+  -o-transition: all 0.5s ease-out;
+  transition: all 0.5s ease-out;
+}
+
+.header .header-nav.small {
+  margin-top: 0;
+}
+
+.header-nav .avatar {
+  float: left;
+  display: inline-block;
+  height: 100%;
+  border: 0.5px solid white;
+  border-radius: 18px;
+}
+.header-nav .avatar img {
+  display: block;
+  width: 64px;
+  height: 64px;
+  overflow: hidden;
+  border-radius: 100%;
+}
+
+.header-nav .nav-title {
+  display: inline-block;
+  padding-left: 10px;
+  height: 100%;
+  line-height: 60px;
+}
+
+.nav-title a {
+  height: 50px;
+  font-size: 20px;
+}

themes/gokarna/static/js/main.js

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+$(window).scroll(function () {
+    var sc = $(window).scrollTop()
+    if (sc > 100) {
+        $(".header").addClass("small");
+        $(".header-nav").addClass("small");
+    } else {
+        $(".header").removeClass("small");
+        $(".header-nav").removeClass("small");
+    }
+});