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HTML 

              
                <!--The Main Thing-->
<div id="wrapper">
  <div class="phone view_1" id="phone_1">
    <iframe src="https://example.com" id="frame_1"></iframe>
  </div>
</div>

<!--Controls etc.-->
<div id="controls">
  <div>
    <label for="iframeURL">URL:</label>
    <input type="url" id="iframeURL" placeholder="https://example.com" value="https://example.com" />
  </div>
  <div>
    <label for="iframeWidth">Width:</label>
    <input type="number" id="iframeWidth" placeholder="400" value="400" />
  </div>
  <div>
    <label for="iframeHeight">Height:</label>
    <input type="number" id="iframeHeight" placeholder="650" value="650" />
  </div>
  <!--Idea by /u/aerosole-->
  <div>
    <label for="iframePerspective">Add perspective:</label>
    <input type="checkbox" id="iframePerspective" checked="true" />
  </div>
</div>
<div id="views">
  <button value="1" type="button">View 1 - Laying</button>
  <button value="2" type="button">View 2 - Side</button>
  <button value="3" type="button">View 3 - Front</button>
</div>
<div id="linkBack" style="position:absolute;right:0px;bottom:0px;background-color:#333;margin:0;width:60px;padding:5px"><a href="https://rilling.dev" target="_blank" style="font-size:14px;text-decoration:none;color:#fff;padding:0 0 0 5px;">My Site</a></div>
!

CSS 

              
                  @import url(https://fonts.googleapis.com/css?family=Open+Sans:400,600,300);
  body {
    font-family: 'Open Sans', sans-serif;
    background-color: #FFFAF6;
  }
  /*Basic Phone styling*/
  
  .phone {
    border: 40px solid #ddd;
    border-width: 55px 7px;
    border-radius: 40px;
    margin: 50px auto;
    overflow: hidden;
    transition: all 0.5s ease;
  }
  
  .phone iframe {
    border: 0;
    width: 100%;
    height: 100%;
  }
  /*Different Perspectives*/
  
  .phone.view_1 {
    transform: rotateX(50deg) rotateY(0deg) rotateZ(-50deg);
    box-shadow: -3px 3px 0 #BBB, -6px 6px 0 #BBB, -9px 9px 0 #BBB, -12px 12px 0 #BBB, -14px 10px 20px #666;
  }
  
  .phone.view_2 {
    transform: rotateX(0deg) rotateY(-60deg) rotateZ(0deg);
    box-shadow: 5px 1px 0 #BBB, 9px 2px 0 #BBB, 12px 3px 0 #BBB, 15px 4px 0 #BBB, 0 7px 20px #999;
  }
  
  .phone.view_3 {
    transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg);
    box-shadow: 0px 3px 0 #BBB, 0px 4px 0 #BBB, 0px 5px 0 #BBB, 0px 7px 0 #BBB, 0px 10px 20px #666;
  }
  /*Controls*/
  
  #controls {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 0.9em;
    color: #333;
  }
  
  #controls div {
    margin: 10px;
  }
  
  #controls div label {
    width: 120px;
    display: block;
    float: left;
  }
  
  #views {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 200px;
  }
  
  #views button {
    width: 198px;
    border: 1px solid #bbb;
    background-color: #fff;
    height: 40px;
    margin: 10px 0;
    color: #666;
    transition: all 0.2s;
  }
  
  #views button:hover {
    color: #444;
    background-color: #eee;
  }
  
  @media (max-width:900px) {
    #wrapper {
      transform: scale(0.8, 0.8);
    }
  }
  
  @media (max-width:700px) {
    #wrapper {
      transform: scale(0.6, 0.6);
    }
  }
  
  @media (max-width:500px) {
    #wrapper {
      transform: scale(0.4, 0.4);
    }
  }
!

JS 

              
                //Check out more cool stuff on my site: https://rilling.dev/

/*Only needed for the controls*/
var phone = document.getElementById("phone_1"),
  iframe = document.getElementById("frame_1");

/*View*/
function updateView(view) {
  if (view) {
    phone.className = "phone view_" + view;
  }
}

/*Controls*/
function updateIframe() {
  iframe.src = document.getElementById("iframeURL").value;

  phone.style.width = document.getElementById("iframeWidth").value + "px";
  phone.style.height = document.getElementById("iframeHeight").value + "px";

  /*Idea by /u/aerosole*/
  document.getElementById("wrapper").style.perspective = (
    document.getElementById("iframePerspective").checked ? "1000px" : "none"
  );
}
updateIframe();

/*Events*/
document.getElementById("controls").addEventListener("change", function() {
  updateIframe();
});

document.getElementById("views").addEventListener("click", function(evt) {
  updateView(evt.target.value);
});
!
999px

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