A Code by Metehan

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/*--------------------------------------------------------------
/** 1. Normalize
--------------------------------------------------------------*/
html, body {
  position: relative;
  width: 100%;
  height: 100%;
  font-family: Source Sans Pro, Roboto,sans-serif;
}
html {
  font-size: 100%;
  font-family: sans-serif;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  font-style: normal;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility
}
article, aside, details, figcaption, figure, footer, header, main, menu, nav, section, summary {
  display: block;
}
audio, canvas, progress, video {
  display: inline-block;
  vertical-align: baseline;
}
audio:not([controls]) {
  display: none;
  height: 0;
}
[hidden],
template {
  display: none;
}
a {
  background-color: transparent;
  outline: 0;
  text-decoration: none;
  cursor: pointer;
  -webkit-text-decoration-skip: objects;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
}
abbr[title] {
  border-bottom: none;
  text-decoration: underline;
  text-decoration: underline dotted;
}
b, strong, .strong {
  font-weight: bolder;
}
dfn {
  font-style: italic;
}
mark {
  background-color: #ff0;
  color: #111;
}
small {
  font-size: 80%;
}
sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}
sup {
  top: -0.5em;
}
h1 {
  font-size: 2em;
  margin: 0.67em 0;
}
h1, h2, h3, h4, h5, h6, ul, ol, dl, li, dd, small {
  padding: 0;
}
img {
  border: 0;
}
svg:not(:root) {
  overflow: hidden;
  display: block;
}
figure {
  margin: 1em 40px;
}
hr {
  height: 0;
  overflow: visible;
  -webkit-box-sizing: content-box;
  -moz-box-sizing: content-box;
  box-sizing: content-box;
}
pre {
  overflow: auto;
}
code, kbd, pre, samp {
  font-family: Courier, monospace;
  font-size: 1em;
}
blockquote::before, blockquote::after,
q::before, q::after {
  content: '';
}
blockquote, q {
  quotes: "" "";
}
button, input, optgroup, select, textarea {
  color: inherit;
  font: inherit;
  margin: 0;
}
button, input {
  overflow: visible;
}
button, select {
  text-transform: none;
}
select {
  text-indent: 45px;
}
button,
html input[type="button"],
input[type="reset"],
input[type="submit"] {
  -webkit-appearance: button;
  cursor: pointer;
}
button[disabled],
html input[disabled] {
  cursor: default;
}
button::-moz-focus-inner,
input::-moz-focus-inner {
  border: 0;
  padding: 0;
}
input {
  line-height: normal;
}
input[type="checkbox"],
input[type="radio"] {
  padding: 0;
  outline: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  height: auto;
}
input[type="search"] {
  -webkit-appearance: textfield;
  outline-offset: -2px;
}
input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}
::-webkit-file-upload-button {
  -webkit-appearance: button;
  font: inherit;
}
fieldset {
  border: 1px solid #c0c0c0;
  margin: 0 2px;
  padding: 0.35em 0.625em 0.75em;
}
legend {
  border: 0;
  padding: 0;
}
textarea {
  overflow: auto;
}
optgroup {
  font-weight: bold;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}
td, th {
  padding: 0;
}

/*--------------------------------------------------------------
/** 2. Base Styles
--------------------------------------------------------------*/
*, *::before, *::after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
html {
  box-sizing: border-box;
}
body {
  font-family: Source Sans Pro;
  font-style: normal;
  font-weight: normal;
  font-size: 19px;
  line-height: 180%;
  color: #777777;
}
body.no-scroll {
    overflow: hidden;
}
a {
  color: #111;
}
a:hover {
  color: #111;
  text-decoration: none;
}
.light a {
  color: #fff;
}
.light a:hover,
.light a:active,
.light a:focus {
  color: #fff;
}
.light b, .light strong {
  color: #fff;
}
ul, ol {
  margin-top: 0;
  margin-bottom: 10px;
  margin-left: 0;
  padding: 0;
  padding-left: 30px;
}
ul ul,
ol ul,
ul ol,
ol ol {
  margin-top: 5px;
  margin-bottom: 0;
}
ul li, ol li {
  margin-bottom: 5px;
  outline: 0;
}
ul li.active a{
  color: #111;
}
ul li:last-child,
ol li:last-child {
  margin-bottom: 0;
}
.list-unstyled {
  padding-left: 0;
  list-style: none;
}
.list-inline {
  padding-left: 0;
  list-style: none;
  margin-left: -0.5rem;
}
.list-inline > li {
  display: inline-block;
  padding-left: 1rem;
  padding-right: 1rem;
}
dl {
  margin-top: 0;
  margin-bottom: 2rem;
}
dt,
dd {
  line-height: 1.42857143;
}
dt {
  font-weight: bold;
}
dd {
  margin-left: 0;
}
button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  outline: 0;
}
figure {
  margin: 0;
}
img {
  display: inline-block;
  border: 0;
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}
::selection {
  background: rgba(0,0,0,0.8);
  color: #fff;
  text-shadow: none;
}
::-moz-selection {
  background: rgba(0,0,0,0.8);
  color: #fff;
  text-shadow: none;
}
::-webkit-input-placeholder {
  color: #939393; /* WebKit browsers */
  -webkit-transition: color .2s;
  transition: color .2s;
}
::-moz-placeholder {
  color: #939393; /* Mozilla Firefox 19+ */
  -webkit-transition: color .2s;
  transition: color .2s;
}
:-ms-input-placeholder {
  color: #939393;/* Internet Explorer 10+ */
  -webkit-transition: color .2s;
  transition: color .2s;
}
::placeholder {
  color: #939393;
  -webkit-transition: color .2s;
  transition: color .2s;
}

.nav {
	position: fixed;
  width: 200px;
  bottom: 0;
  right: 200px;
  padding: 20px;
  border-radius: 10px 0 0 10px;
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  justify-content: space-between;
  color: #d1d1d1;
  transform: translate3d(100%, 0, 0);
  transition: transform 0.3s ease-in;
}
.nav.show {
  transform: translate3d(0, 0, 0);
}
.btn {
	display: block;
  padding: 0px 10px;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
	border-radius: 8px;
	background: #0070e4;
	color: #fff;
  box-shadow: rgba(0,0,0,0.1) 0px 0px 20px;
	transition: background 0.3s ease-out;
}
.btn:hover {
	background: #2c8bed;
}
.devices {
	display: flex;
}
.devices a {
  padding: 2px;
}
#template-selector {
	background: #111;
}
#iframe-view {
	margin: auto;
  background: #fff;
  height: 100vh;
}
body {
	overflow: hidden;
	text-align: center;
	background: #111111;
}
.btn-settings {
  padding: 12px;
  border: 5px solid #fff;
  width: 150px;
  height: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  border-radius: 50px;
  transition: transform 0.3s ease-out;
}
.btn-settings:hover {
  transform: scale(1.1);
  color: #fff;
}
.cart {
  background: #221fe3;
}
.bundle {
  background: #ffa826;
}
@media only screen and (max-width: 991px) {
  a.device {
    display:none;
  }
}
</style>
</head>
<body>

</body>
<script src="jquery-1.11.0.min.js"></script>
<script type="text/javascript">
(function($) {

"use strict";

$(document).ready(function(){

// $('.btn-settings').on('click', function(e) {
    //   e.preventDefault();
    //   $('#demo-page-nav').toggleClass('show');
    // });

$('#template-selector').on('change', function() {
  		var demo_url = this.value;
  		var product_url = $(this).find(':selected').data('product');

$("#iframe-view").attr("src", demo_url);
  		$("#product-link").attr("href", product_url);
  	})

$('a.device').click(function(e){
      e.preventDefault();
      var screen_size = $(this).attr('href');
      var iframe_width = 640;
      var iframe_height = 600;

switch(screen_size) {
        case '#desktop':
          iframe_width = "100%";
          iframe_height = "100%";
        break;

case '#laptop':
          iframe_width = "1280px";
          iframe_height = "1024px";
        break;

case '#tab':
          iframe_width = "1024px";
          iframe_height = "1366px";
        break;

default:
        case '#phone':
          iframe_width = "375px";
          iframe_height = "812px";
        break;

}
      $('#iframe-view').attr("width", iframe_width);
      $('#iframe-view').attr("height", iframe_height);
    });

});

})(jQuery);

</script>
</html>

A Code by Metehan

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