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HTML 

              
                <center>

<div class="device device-iphone">
  <!-- Your Mockup Here! -->
  <img src="https://picsum.photos/375/812">
</div>

</center>
!

CSS 

              
                // By: J.T. Brown
// Frontend Developer and UX/UI Designer
// EpogeeDesign.com
// Twitter: twitter.com/epogeedesign
:root {
  --color-light: 255,255,255;
  --color-dark: 0,0,0;
}

html {
  @media (max-width:580px) {
    font-size:calc((16 / 580) * 100vw);
  }
}

*,*:before,*:after { box-sizing:border-box; }

.device-iphone {
  //Phone Size:
  font-size:100%;
  @media (max-height:950px) { font-size:90%; }
  @media (max-height:850px) { font-size:80%; }
  @media (max-height:750px) { font-size:70%; }
  @media (max-height:650px) { font-size:60%; }
  @media (max-height:550px) { font-size:50%; }
  @media (max-height:350px) { font-size:40%; }
  
  position:relative;
  
  width:375 / 16em;
  height:812 / 16em;
  //PHONE BODY
  border-radius:60 / 16em;
  padding:15 / 16em;
  box-sizing:content-box;
  background:rgba(var(--color-dark),1);
  box-shadow:
    0 2 / 16em 2 / 16em 3 / 16em rgba(var(--color-dark),1), 
    0 -1 / 16em 4 / 16em 3 / 16em rgba(var(--color-light),.55), 
    0 -1 / 16em 4 / 16em 3 / 16em rgba(var(--color-dark),1), 
    0 0 0 8 / 16em rgba(var(--color-light),.11),
    0 0 0 8 / 16em rgba(var(--color-dark),1),
    inset 0 -3 / 16em 5 / 16em 0 rgba(var(--color-light),.1), 
    inset 0 -3 / 16em 5 / 16em 0 rgba(var(--color-dark),1), 
    inset 0 -5 / 16em 2 / 16em 4 / 16em rgba(var(--color-dark),.77), 
    inset 0 -5 / 16em 1 / 16em 0 rgba(var(--color-light),.18), 
    inset 0 0 / 16em 10 / 16em 3 / 16em rgba(var(--color-dark),.87), 
    inset 0 5 / 16em 1 / 16em 0 rgba(var(--color-light),.18), 
    inset 0 -1 / 16em 5 / 16em 5 / 16em rgba(var(--color-light),.5),
    0 0 20 / 16em 10 / 16em fade(black,30), //Iphone Drop Shadow
  ;

  //BUTTONS
  &:after {
    content:'';
    position:absolute;
    width:calc(100% + .625em + .625em + .625em);
    height:calc(100% + .625em + .625em + .625em);
    left:-12 / 16em;
    top:-12 / 16em;
    filter: drop-shadow(-1px 0px 1px rgba(0,0,0,.3));
    background-repeat:no-repeat;
    background-image:
      linear-gradient(to right, #454545, #979797, #555555 80%, #484848), // Btn- Body
      radial-gradient(circle at top right, #3c3c3c 10%, #808080, #6d6d6d 54%, transparent 70%, transparent 100%), //Btn - Bottom curve
      radial-gradient(circle at bottom right, #3c3c3c 10%, #808080, #6d6d6d 54%, transparent 70%, transparent 100%), // Btn - Top curve
      
      linear-gradient(to right, #454545, #979797, #555555 80%, #484848), // Btn- Body
      radial-gradient(circle at top right, #3c3c3c 10%, #808080, #6d6d6d 54%, transparent 70%, transparent 100%), //Btn - Bottom curve
      radial-gradient(circle at bottom right, #3c3c3c 10%, #808080, #6d6d6d 54%, transparent 70%, transparent 100%), // Btn - Top curve
      
      linear-gradient(to right, #454545, #979797, #555555 80%, #484848), // Btn- Body
      radial-gradient(circle at top right, #3c3c3c 10%, #808080, #6d6d6d 54%, transparent 70%, transparent 100%), //Btn - Bottom curve
      radial-gradient(circle at bottom right, #3c3c3c 10%, #808080, #6d6d6d 54%, transparent 70%, transparent 100%) // Btn - Top curve
    ;
    
    --btn-offset:0;
    --btn-width: 5px;
    z-index:-1;
    
    background-size:
      var(--btn-width) 25 / 16em,
      var(--btn-width) 5 / 16em,
      var(--btn-width) 5 / 16em,
      
      var(--btn-width) 60 / 16em,
      var(--btn-width) 5 / 16em,
      var(--btn-width) 5 / 16em,
      
      var(--btn-width) 60 / 16em,
      var(--btn-width) 5 / 16em,
      var(--btn-width) 5 / 16em
    ;
    background-position:
      var(--btn-offset) 13%,
      var(--btn-offset) calc(13% + 1.375em),
      var(--btn-offset) calc(13% - .5em),
      
      var(--btn-offset) 21%,
      var(--btn-offset) calc(21% + 3.0625em),
      var(--btn-offset) calc(21% - 1em),
      
      var(--btn-offset) 32%,
      var(--btn-offset) calc(32% + 2.5625em),
      var(--btn-offset) calc(32% - 1.375em)
    ;
  }
  
  //BEZEL
  &:before {
    --sml-curve: .5em;
    --big-curve: 1.375em;
    --tot-height: calc(var(--sml-curve) + var(--big-curve));
    --spkr-height: .375em;
    --cam-height:1em;
    content:'';
    position:absolute;
    z-index:1;
    width:230 / 16em;
    height:var(--tot-height);
    left:50%;
    transform:translateX(-50%);
    filter: drop-shadow(0px .0625em .0625em fade(white,10));
    background-repeat:no-repeat;
    background-image:
      linear-gradient(to right,#161616,#161616), // Speaker
      linear-gradient(to right,#282828,#282828), // Speaker
      radial-gradient(circle, fade(white,5) 40%, transparent 80%), // Camera - Glare (White)
      radial-gradient(circle, #192940 40%, transparent 60%), // Camera - Glare (Blue)
      radial-gradient(circle, #161616 50%, transparent 50%), // Camera - Shape
      linear-gradient(to right,black,black), // Top black rectangle
      radial-gradient(circle at bottom right, transparent 0, transparent 70%, black 70%, black 100%), //Right curve
      radial-gradient(circle at bottom left, transparent 0, transparent 70%, black 70%, black 100%), //Left Curve
      radial-gradient(circle at top right, black 0, black 70%, transparent 70%, transparent 100%), //left Curve
      radial-gradient(circle at top left, black 0, black 70%, transparent 70%, transparent 100%), //Right Curve
      linear-gradient(to right,black,black) // Bottom black rectangle
    ;
 
    background-size: 
      3.75em var(--spkr-height),
      3.75em var(--spkr-height),
      calc(var(--cam-height) * .3) calc(var(--cam-height) * .3),
      calc(var(--cam-height) * .66) calc(var(--cam-height) * .66),
      var(--cam-height) var(--cam-height),
      calc(100% - (var(--sml-curve) + var(--sml-curve))) calc(100% - var(--big-curve)), // Top black rectangle
      var(--sml-curve) var(--sml-curve), //Right curve
      var(--sml-curve) var(--sml-curve), //Left Curve
      var(--big-curve) var(--big-curve), //Left Curve
      var(--big-curve) var(--big-curve), //Right Curve
      calc(102% - (var(--sml-curve) + var(--sml-curve) + var(--big-curve) + var(--big-curve))) 100% // Bottom black rectangle
      
    ;
    background-position:
      50% calc(50% - (var(--spkr-height) * .5)),
      50% calc(50% - (-1px + (var(--spkr-height) * .5))),
      calc(70% - .1875em) calc(25% + .0625em),
      calc(70% - .125em) calc(25% + .0625em),
      70% 25%,
      var(--sml-curve) 0, // Top black rectangle
      100% 0, //Right curve
      0% 0, //Left Curve
      var(--sml-curve) calc((var(--sml-curve) )), //Left Curve
      calc(100% - var(--sml-curve)) calc((var(--sml-curve) )), //Right Curve
      calc(var(--sml-curve) + var(--big-curve) - 1px) 0, // Bottom black rectangle
      
    ;
  }
  
  img {
    width:100%;
    height:auto;
    display:block;
    max-width:375px;
    height:auto;
    border-radius:45 / 16em;
  }
}


//FOR USE IN CODEPEN ONLY, Not needed for project.
  //Animated BG Credit: https://codepen.io/P1N2O/pen/pyBNzX
body, html { height:100%;overflow:hidden; }

body {
	background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
	background-size: 400% 400%;
	animation: gradient 15s ease infinite;
}

@keyframes gradient {
	0% { background-position: 0% 50%; }
	50% { background-position: 100% 50%; }
	100% { background-position: 0% 50%; }
}

center {
  display:flex;
  align-items:center;
  justify-content:center;
  height:100%;
  width:100%;
  text-align:left;
  margin:0 auto;
  box-sizing:border-box;
}
!

JS
!
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