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HTML 

              
                <div class="container">
  <div id="macbook-top">
    <div class="macbook-screen">
      <i class="fa fa-apple logo"></i>
      <div class="macbook-window">
        <div class="macbook-browser">
          <div class="content-navbar">
            <div id="top-menu">
              <div id="content-navbar-close"></div>
              <div id="content-navbar-minimize"></div>
              <div id="content-navbar-expand"></div>
            </div>
            <div id="below-menu">
              <div id="back-forward">
                <div id="back"></div>
                <div id="forward"></div>
              </div>
              <div id="url"></div>
              <div id="search"></div>
            </div>
          </div>
          <!-- Form content -->
          <div class="content-form">
            <form id="form-message" onsubmit="return submitForm()">
            <input type="text" class="form-control" placeholder="Name" name="firstname" data-validation-required-message="Please enter your first name.">
            <input type="email" class="form-control" placeholder="Email" name="email" data-validation-required-message="Please enter your email.">
            <input type="tel" class="form-control" placeholder="Phone Number" name="phone" data-validation-required-message="Please enter your phone address.">
            <input class="form-control" placeholder="Message" name="message" id="message" data-validation-required-message="Please enter some message." ></input>
            <input type="submit" id="submit" value="Send message!">
            </form>
          </div>
        </div>
      </div>
    </div>
  </div>
  <div id="macbook-bottom">
    <div id="macbook-notch">
    </div>
  </div>
  <div id="macbook-bottom-edge">
  </div>
</div>
!

CSS 

              
                @bg: #db7093;

* {
  margin: 0 auto;
  -webkit-user-select: none;
}

body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background-color: @bg;
}

.container {
  height: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
  flex-direction: column;

  #macbook-top {
    position: relative;
    width: 650px;
    height: 400px;
    background-color: black;
    border: 4px solid white;
    border-radius: 1.5rem;

    // Desktop-only drawing. Hide if width < 500px
    @media screen and (max-width: 500px) {
      visibility: hidden;
    }

    .macbook-screen {
      position: relative;
      width: 585px;
      height: 337.5px;
      border: 32.5px solid black;
      border-radius: 1.4rem;
      
      // Apple logo animation
      @keyframes apple-logo-disappear {
        0% {
          opacity: 1;
        }
        100% {
          opacity: 0;
        }
      }
      
      .logo {
        position: absolute;
        left: 257.5px;
        top: 115px;
        font-size: 80px;
        color: #fff;
        //animation: apple-logo-disappear 1s;
        //opacity: 0;
      }
      
    }

    .macbook-window {
      
      @keyframes screen-boot-up {
        0% {
          opacity: 0;
        }
        100% {
          opacity: 1;
        }
      }
      // Boot-up animation
      animation: screen-boot-up 2.5s ease-in;
      position: relative;
      top: 5px;
      height: 310px;
      width: 100%;
      background-color: azure;
    }
    
    .macbook-window::before {
      content: "";
      position: absolute;
      background-color: lightblue;
      left: 285px;
      top: -22.5px;
      width: 7.5px;
      height: 7.5px;
      border-radius: 10px;
    }
    
    .macbook-window::after {
      content: "";
      position: absolute;
      background-color: white;
      left: 288.75px;
      top: -19.25px;
      width: 2.5px;
      height: 2.5px;
      border-radius: 10px;
      opacity: 0.4;
    }

    .macbook-browser {
      .content-navbar {
        display: flex;
        flex-direction: column;
        width: 100%;
        height: 28.5px;
        background-color: grey;

        #top-menu {
          display: flex;
          width: 100%;

          #content-navbar-close {
            position: relative;
            margin: 0;
            left: 7.5px;
            top: 4px;
            width: 7.5px;
            height: 7.5px;
            border-radius: 5px;
            background-color: red;
          }

          #content-navbar-minimize {
            position: relative;
            margin: 0;
            left: 15px;
            top: 4px;
            width: 7.5px;
            height: 7.5px;
            border-radius: 5px;
            background-color: yellow;
          }

          #content-navbar-expand {
            position: relative;
            margin: 0;
            left: 22.5px;
            top: 4px;
            width: 7.5px;
            height: 7.5px;
            border-radius: 5px;
            background-color: green;
          }
        }

        #below-menu {
          display: flex;
          width: 100%;

          #back-forward {
            position: relative;
            display: flex;
            top: 7.5px;
            left: 6.5px;
            margin: 0;
            height: 10px;
            width: 40px;
            background-color: azure;

            #back {
              position: relative;
              top: 0;
              left: 0;
              margin: 0;
              height: 10px;
              width: 20px;
              background-color: lightgray;
            }

            #back::before {
              content: "\f060";
              position: relative;
              font-family: FontAwesome;
              color: grey;
              top: -7.5px;
              left: 6.5px;
              font-size: 7.5px;
            }

            #forward {
              position: relative;
              top: 0;
              margin: 0;
              height: 10px;
              width: 20px;
              background-color: lightgray;
            }

            #forward::before {
              content: "\f061";
              position: relative;
              font-family: FontAwesome;
              color: grey;
              top: -7.5px;
              left: 6.5px;
              font-size: 7.5px;
            }
          }

          #url {
            position: relative;
            height: 10px;
            width: 400px;
            background-color: azure;
            top: 7.5px;
            left: 7.5px;
          }

          #url::before {
            content: "\f067";
            position: relative;
            font-family: FontAwesome;
            color: grey;
            top: -7.5px;
            left: 5px;
            font-size: 6px;
          }

          #search {
            position: relative;
            height: 10px;
            width: 110px;
            background-color: azure;
            top: 7.5px;
            left: 0.5px;
            border-radius: 5px;
          }

          #search::before {
            content: "\f002";
            position: relative;
            font-family: FontAwesome;
            color: grey;
            top: -7.2px;
            left: 4px;
            font-size: 7px;
          }
        }
      }

      .content-form {
        positioon: relative;
        display: flex;
        height: 275px;
        flex-direction: column;
        align-items: center;
        justify-content: center;

        // Desktop-only drawing. Hide if width < 500px
        @media screen and (max-width: 500px) {
          visibility: visible;
        }

        form {
          display: flex;
          flex-direction: column;
          width: 75%;

          input {
            width: 100%;
            margin: 7.5px 0;
            font-family: Noto Sans;
          }

          #message {
            padding-bottom: 40px;
          }

          #submit {
            width: 30%;
            align-self: center;
            margin-top: 20px;
          }
        }
      }
    }
  }

  #macbook-bottom {
    position: relative;
    width: 800px;
    height: 23.75px;
    background-color: grey;
    bottom: 15px;
    z-index: 10;
    overflow: hidden;

    // Desktop-only drawing. Hide if width < 500px
    @media screen and (max-width: 500px) {
      visibility: hidden;
    }
  }

  #macbook-bottom::before {
    content: "";
    position: absolute;
    left: 45px;
    width: 725px;
    height: 23.75px;
    background-color: darkgrey;
    overflow: hidden;
  }

  #macbook-bottom::after {
    content: "";
    position: absolute;
    right: 0;
    width: 35px;
    height: 23.75px;
    background-color: azure;
  }

  #macbook-notch {
    position: absolute;
    left: 300px;
    height: 12.5px;
    width: 200px;
    background: linear-gradient(to left, #c0c0c0 50%, #e5e4e2 50%);
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
  }

  #macbook-bottom-edge {
    position: absolute;
    bottom: 15px;
    width: 700px;
    height: 20px;
    position: relative;
    border-right: 50px solid transparent;
    border-top: 17.5px solid #c0c0c0;
    border-left: 50px solid transparent;
    box-sizing: content-box;
    z-index: 3;

    // Desktop-only drawing. Hide if width < 500px
    @media screen and (max-width: 500px) {
      visibility: hidden;
    }
  }
}
!

JS 

              
                // Desktop only drawing - Defaults to form only on mobile
// Form submission handler --->
function submitForm(){
  const forminputs = Array.from(document.getElementById('form-message'));
  const valuesObject = forminputs.reduce((acc, el) => {
    if (el.name) { acc[el.name] = el.value; };
    return acc;
  }, {});
  alert(`Thanks for your message! Here is your data: \nName: ${valuesObject.firstname}\nEmail: ${valuesObject.email}\nPhone Number: ${valuesObject.phone}\nMessage: ${valuesObject.message}`);
  return false;
}
!
999px

Console