Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>


Hello Camper!

For now, the test suite only works in Chrome! Please read the README below in the JS Editor before beginning. Feel free to delete this message once you have read it. Good luck and Happy Coding! 

- The freeCodeCamp Team 


  <link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
  <div class="whole-1 black" id="whole-1"></div>

  <div class="star-1 stars"></div>
  <div class="star-2 stars"></div>
  <div class="star-3 stars"></div>
  <div class="star-4 stars"></div>

  <main id="main">
    <h1 id="title">Leonard Susskind

          <h2 Id="tribute-info"> From plumber in the Bronx to dreamer of Blackwholes at Stanford.</h2>

          <div id="img-div">
            <img id="image" src="https://i.ytimg.com/vi/VvOZd_tbZ-w/maxresdefault.jpg">
            <alt="picture of physics proffesor Leonard Suskind">
              <p id="img-caption"> Blackwhole theorist and proponent of the holographic universe principle.</p>
          <h3>Why is he kewl?</h3>
          <section id="paragraph">
            <p> Leonard Susskind was born in the South Bronx section of New York City. He began working as a plumber at the age of 16, taking over from his father who had become ill. Later, he enrolled in the City College of New York as an engineering student
              but changed ended up changing career paths and ended up graduating with a B.S. in physics instead in the year 1962.</p>

            <p> Susskind recalls the moment he discussed with his father this change in career path: "When I told my father I wanted to be a physicist, he said: ‘Hell no, you ain’t going to work in a drug store’. I said, "No, not a pharmacist." I said, ‘Like
              Einstein.’ He poked me in the chest with a piece of plumbing pipe. ‘You ain’t going to be no engineer’, he said. ‘You’re going to be Einstein.’" Susskind then studied at Cornell University under Peter A. Carruthers where he earned his Ph.D.
              in 1965.</p>

            <p> Poffessor Susskind is well known for still using plumbing analogies in explaining complex theories.</p>
          <h3>Interesting Achievments!</h3>
          <ul id="unordered-list">
            <li>The independent discovery of the string theory model of particle physics</l1>
              <li>The theory of quark confinement</l1>
                <li>The second, yet independent, theory of cosmological baryogenesis</l1>
                  <li>String theory of black hole entropy </l1>
                    <li>The holographic principle</l1>
                      <li>M-theory, including development of the BFSS matrix model</l1>
                        <li>Most recently, application of ideas from information and computation theory, such as quantum complexity, to the physics and thermodynamics of black holes, and holographic theories in general</l1>


          <h4> One of my favorite books of his is the Holographic Universe published in 2005.
            <a id="tribute-link" target="_blank" href="https://en.wikipedia.org/wiki/Leonard_Susskind">Click for his Wikki page</a>

  <div class="whole-2 black"></div>

  <div id="back"></div>

  <div class="star-1 stars"></div>
  <div class="star-2 stars"></div>
  <div class="star-3 stars"></div>
  <div class="star-4 stars"></div>

  border-left: 100px solid rgb(20, 17, 61, .5);
  border-right: 100px solid rgb(20, 17, 61, .5);
  box-shadow: inset 5px 10px 50px rgb(20, 17, 61);


#main {
  text-align: center;
  padding: 2em;
  margin-bottom: 1em;
#img-div {
  display: block;
   max-width: 100% ;
    height: auto;
  margin-bottom: 10px;
    font-family: "Arial", "times";
  font-size: 1rem;

#image { 
  display: block;
  max-width: 50%;
    height: auto;
      border-radius: 50%;
   border-style: solid;
  border-color: black;
  border-width: 5px;
  margin-left: auto;
h3 {
  text-align: left;
  font-size: 1em;
		-1px -1px 0 #000,
		1px -1px 0 #000,
		-1px 1px 0 #000,
		1px 1px 0 #000;
  font-size: 1rem;

#title { 
  color: white;
  font-family: lobster; "Arial";
  font-size: 11vw;
		-1px -1px 0 #000,
		1px -1px 0 #000,
		-1px 1px 0 #000,
		1px 1px 0 #000;

#tribute-info { 
  margin-top: 5%;
  font-family:  ;
  color: #EEEE;
		-1px -1px 0 #000,
		1px -1px 0 #000,
		-1px 1px 0 #000,
		1px 1px 0 #000;
  #img-caption {
    font-weight: bold;
      font-style: italic;

#paragraph {
  line-height: 2.3rem;
  text-align: left;
  font-family: "Arial";
  font-size: 1.5rem;
  line-height: 2rem;
  text-align: left;
  font-size: 1rem;
  font-family: "arial";

  position: relative;
  background-color: black;
    height: 90px;
    width: 120px;
  border-radius: 50%;
  margin-left: 10px;
  animation-iteration-count: infinite, 1, 1;
animation-name: twinkle, bounce, small;
  animation-duration: .1s, 10s, 10s;

  animation-name: twinkle;
  animation-duration: .1s;
  margin-left: 0;

.whole-1:hover {
        animation-play-state: paused;
    animation-name: twinkle, rotate;
    animation-duration: 1ms, 20s;
    animation-iteration-count: infinite, infinite;
    .stars {
    background-color: white;
    height: 30px;
    width: 30px;
      border: 1px solid red;
    border-radius: 50%;
    animation-iteration-count: infinite;

   .star-1 {
    margin-top:5px ; 
    margin-left: 60%;
    animation-duration: 3s;
    animation-name: twinkle;

  .star-2 {
    margin-top: 2;
    margin-left: 25%;
    animation-duration: 1s;
    animation-name: twinkle;

  .star-3 {
    margin-top: 0%;
    margin-left: 50%;
    animation-duration: .5s;
    animation-name: twinkle;
.star-4 {
    margin-top: 10%;
    margin-left: 5%;
    animation-duration: .7s;
  animation-name: twinkle;

  @keyframes twinkle {
    20% {
      transform: scale(0.5);
      opacity: 0.5;

    @keyframes bounce {
  0% {
    top: 0px;
  50% {
    top: 300px;
      top: 400px;
       top: 86vh;
        margin-left: 35vw;

@keyframes small{

transform: scale(0.4);
    60% {
      transform: scale(1); 
          transform: scale(0.2);

@keyframes rotate { 100% { transform:rotate(-360deg); } }

/*@keyframes rotate { 
  0% {top:200px; bottom: 0; left: 0; right:0 ;} 
  25%{top:0px; bottom: ; left: 200px; right:0 ;} 
  50%{top:0px; bottom: 0; left: 0; right:200px ;} 
  75%{top:0px; bottom: 200px; left: 0; right:0;}
}  100%{top:0; bottom: 200px; left:; right:0 ;} */

  #back {
    position: fixed;
    z-index: -1;
    padding: 0;
    margin: 0;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: blue;
    background-image: radial-gradient(rgba(18, 6, 6, .2), hsl(200, 21%, 28%), #66c2ff, #ffcccc, #ffeee6);

@media (max-width: 661px){
body {
              // !! IMPORTANT README:

// You may add additional external JS and CSS as needed to complete the project, however the current external resource MUST remain in place for the tests to work. BABEL must also be left in place. 

  - Select the project you would 
    like to complete from the dropdown 
  - Click the "RUN TESTS" button to
    run the tests against the blank 
  - Click the "TESTS" button to see 
    the individual test cases. 
    (should all be failing at first)
  - Start coding! As you fulfill each
    test case, you will see them go   
    from red to green.
  - As you start to build out your 
    project, when tests are failing, 
    you should get helpful errors 
    along the way!

// PLEASE NOTE: Adding global style rules using the * selector, or by adding rules to body {..} or html {..}, or to all elements within body or html, i.e. h1 {..}, has the potential to pollute the test suite's CSS. Try adding: * { color: red }, for a quick example!

// Once you have read the above messages, you can delete all comments. 

🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.