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HTML 

              
                .handle
  .display Lorem ipsum dolor sit amet, consecteteuer adpsim elit
  .buttons
    each v,i in Array(7)
      if (i==0)
        .btn-container.bottom
          button.btn-floor(data-set-floor=i) T
      else
        .btn-container.floor
          button.btn-floor.floor(data-set-floor=i)= i
.building
  .elevator-container
    .elevator
      .elevator-door
      .elevator-light
  .floors
    each v,i in Array(7)
      .floor(data-floor=i)
        if (i==0)
          .floor-door
        else
          .floor-window
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Space+Mono');
body {
  font:sans-serif;
}
*,*:after,*:before {
  box-sizing:border-box;
}
.handle {
  position: absolute;
  width:250px;
  border-radius:15px;
  left:15px;
  top:15px;
  bottom:15px;
  padding:15px;
  background:
    radial-gradient(center, circle,
      rgba(255,255,255,.35),
      rgba(255,255,255,0) 20%,
      rgba(255,255,255,0) 21%),
    radial-gradient(center, circle,
      rgba(0,0,0,.2),
      rgba(0,0,0,0) 20%,
      rgba(0,0,0,0) 21%),
    radial-gradient(center, circle farthest-corner,
      grey,
      lighten(gray,15%));
	background-size: 10px 10px, 10px 10px, 100% 100%;
	background-position: 1px 1px, 0px 0px, center center;
}
.display {
  background:lime;
  background-image:repeating-linear-gradient(0deg,
    darken(lime,5%) 0px,
    darken(lime,5%) 2px,
    transparent 2px,
    transparent 10px),
  repeating-linear-gradient(90deg,
    darken(lime,5%),
    darken(lime,5%) 2px,
    transparent 2px,
    transparent 9px);
  border:11px solid #333;
  border-radius:8px;
  width:100%;
  padding:7px 17px;
  font-family:Space Mono, monospace;
  height:80px;
  overflow-y:hidden;
  color:#000;
  line-height:1.45;
  box-shadow:inset 0px 0px 0px 2px black, 0px 0px 0px 2px black;
  margin-bottom:10px;
}
.buttons {
  display:flex;
  width:100%;
  height:370px;
  justify-content:space-around;
  flex-wrap:wrap-reverse;
}
.btn-container {
  flex-basis:50%;
  position:relative;
  
  &.bottom {
    flex-basis:100%;
  }
}
button.btn-floor {
  position:relative;
  border-radius:50%;
  width:60px;
  height:60px;
  border:2px solid lightgray;
  box-shadow:inset 0px 0px 2px 1px gray, inset 0px -3px 4px rgba(0,0,0,0.3), inset 0px 3px 4px rgba(255,255,255,0.6), 0px -2px 3px rgba(0,0,0,0.6), 0px 1px 2px rgba(255,255,255,0.7), 0px 0px 1px 1px black, 0px 0px 0px 5px gray, 0px 0px 1px 6px black;
  display:block;
  cursor:pointer;
  left:50%;
  top:50%;
  transform:translate(-50%, -50%);
  font-size:23px;
  color:#3c3c3c;
  outline:none;
  
  &:hover {
    border-color:lime;
  }
  &:active, &.active {
    background:lime;
    color:lighten(lime,40%);
    border-color:green;
  }
}

.building {
  width: 300px;
  position: absolute;
  background: #ccc26b;
  background-image:linear-gradient(
      transparentize(#ccc26b,.4), 
      transparentize(#ccc26b,.4)
  ),url("http://gdj.graphicdesignjunction.com/wp-content/uploads/2011/05/photoshop-texture-35.jpg");
  background-size:cover,cover;
  height: 460px;
  left: 300px;
  top: 50px;
  &:before {
    position:absolute;
    display:block;
    content:"";
    background:inherit;
    top:-30px;
    left:85px;
    width:130px;
    height:30px;
  }
  &:after {
    position:absolute;
    display:block;
    content:"";
    background:#333;
    bottom:-20px;
    left:-15px;
    width:330px;
    height:20px;
  }
}
.floors {
  display: flex;
  height: 100%;
  width: 100%;
  justify-content: stretch;
  flex-direction: column-reverse;
  
  .floor {
    position:relative;
    height: 100%;
    
    &:after {
      content:"";
      display:block;
      width:100%;
      position:absolute;
      top:0;
      border-top:10px solid turquoise;
      opacity:.8;
    }
    
    .floor-door {
      background:silver;
      background-image:repeating-linear-gradient(
        90deg,
        transparent 0px,
        transparent 33px,
        #333 33px,
        #333 37px,
        transparent 37px,
        transparent 70px
      );
      width:80px;
      height:55px;
      border:5px solid #333;
      border-bottom:none;
      position:absolute;
      bottom:0;
      left:5px;
    }
    
    .floor-window {
      position:absolute;
      width:100%;
      left:0;
      top:0;
      bottom:0;
      right:0;
      height:100%;
      
      &:after, &:before {
        content:"";
        position:absolute;
        display:block;
        background:goldenrod;
        border:2px solid darkgoldenrod;
        width:40px;
        height:40px;
        top:20px;
        margin-left:-20px;
      }
      &:after {
        left:80%;
      }
      &:before {
        left:20%;
      }
    }
  }
}
.elevator-container {
  position:absolute;
  background:turquoise;
  width:100px;
  left:100px;
  height:100%;
  z-index: 10;
  
  .elevator {
    width:40px;
    height:60px;
    margin-left:-20px;
    margin-top:7px;
    left:50%;
    background:white;
    border:3px solid #333;
    border-top-width:10px;
    position:absolute;
    
    &-door {
      width:100%;
      height:100%;
      right:0;
      position:relative;
      background:silver;
      background:radial-gradient(center, circle,
      rgba(255,255,255,.35),
      rgba(255,255,255,0) 20%,
      rgba(255,255,255,0) 21%),
    radial-gradient(center, circle,
      rgba(0,0,0,.2),
      rgba(0,0,0,0) 20%,
      rgba(0,0,0,0) 21%),
    radial-gradient(center, circle farthest-corner,
      grey,
      lighten(gray,4%));
	background-size: 7px 7px, 7px 7px, 100% 100%;
	background-position: 1px 1px, 0px 0px, center center;
    }
    &-light {
      position:absolute;
      top:-8px;
      left:50%;
      border-radius:50%;
      border:1px solid black;
      width:8px;
      height:8px;
      margin-left:-4px;
      background:lime;
    }
  }
}
!

JS 

              
                window.onload = () => {
  let elevator = document.querySelector(".elevator");
  let elevatorDoor = elevator.querySelector(".elevator-door")
  let elevatorLight = elevator.querySelector(".elevator-light")
  let floors = document.querySelectorAll(".building .floor")
  let buttons = document.querySelectorAll(".handle button")
  let display = document.querySelector(".display")
  
  var destinyFloors = [];
  var currentFloor = null;
  var leavingFloor = false;
  var elevatorStatus = 'idle';
  var elevatorWaitingTime = 2000;
  var elevatorWaitTime = 2000;
  var previousTime = new Date().getTime();
  var deltaTime = 0
  
  elevatorDoor.style.width = "1px";
  elevator.style.offsetTop = floors[0].offsetTop+"px";
  // moving, opening, waiting, closing, idle
  
  buttons.forEach(button => {
    button.addEventListener("click",function() {
      let setFloor = this.getAttribute("data-set-floor");
      let selectedFloor = Array.prototype.slice.apply(
        document.querySelectorAll(".building .floor")
      ).filter(f => f.getAttribute("data-floor") == setFloor)[0];
      
      if (destinyFloors.find(df => df.getAttribute("data-floor") == selectedFloor.getAttribute("data-floor")) == null) {
        if (selectedFloor.getAttribute("data-floor") != currentFloor.getAttribute("data-floor")) {
          destinyFloors.push(selectedFloor);
        }
      }
      leavingFloor = true;
      if (elevatorStatus == 'idle') {
        elevatorStatus = 'closing'
      }
    })
  })
  
  function updateElevator() {
    deltaTime = new Date().getTime()-previousTime;
    previousTime = new Date().getTime()
    
    requestAnimationFrame(updateElevator);
    // console.log(elevator.offsetTop)
    var elevatorWithinFloor = false;
    for (let i=0; i<floors.length; i++) {
      if (elevator.offsetTop > floors[i].offsetTop && elevator.offsetTop < floors[i].offsetTop+10) {
        // console.log("elevator within floor "+i);
        elevatorWithinFloor = true;
        currentFloor = floors[i];
        
        if (!leavingFloor) {
          if (destinyFloors.some(df => df.getAttribute("data-floor") == currentFloor.getAttribute("data-floor"))) {
            // console.log("Reached floor")
            destinyFloors = destinyFloors.filter(df => df.getAttribute("data-floor") != currentFloor.getAttribute("data-floor"));
            elevatorStatus = 'opening';
          }
          
        } else {
          // console.log("Leaving floor")
        }
      }
    }
    
    if (!elevatorWithinFloor) {
      // console.log("Elevator out of any floor")
      if (leavingFloor) {
        leavingFloor = false;
      }
    }
    
    if (elevatorStatus != 'moving') {
      if (elevatorStatus == 'opening') {
        if (elevatorDoor.offsetWidth > 1) {
          elevatorDoor.style.width = (elevatorDoor.offsetWidth-1)+"px";
        } else {
          if (destinyFloors.length == 0) {
            elevatorStatus = 'idle'
          } else {
            elevatorStatus = 'waiting'
            elevatorWaitingTime = elevatorWaitTime
          }
        }
      }
      if (elevatorStatus == 'waiting') {
        if (elevatorWaitingTime > 0) {
          elevatorWaitingTime -= deltaTime;
        } else {
          elevatorStatus = 'closing';
        }
      }
      if (elevatorStatus == 'closing') {
        if (elevatorDoor.offsetWidth < 34) {
          elevatorDoor.style.width = (elevatorDoor.offsetWidth+1)+"px";
        } else {
          elevatorStatus = 'moving'
        }
      }
    }
    
    if (destinyFloors[0] != null && elevatorStatus == 'moving') {
      if (destinyFloors[0].offsetTop > elevator.offsetTop-7) {
        elevator.style.top = (elevator.offsetTop-7+2)+"px";
      } else {
        elevator.style.top = (elevator.offsetTop-7-2)+"px";
      }
    }
    
    updateButtons();
    updateDisplay();
  }
  updateElevator();
  
  function updateDisplay() {
    display.innerHTML = [
      "Térreo",
      "Primeiro Andar",
      "Segundo Andar",
      "Terceiro Andar",
      "Quarto Andar",
      "Quinto Andar",
      "Sexto Andar"
    ][parseInt(currentFloor.getAttribute("data-floor"))] + " " +
    (destinyFloors[0] != null ? (
      destinyFloors[0].offsetTop < currentFloor.offsetTop ? 
        '<br />Subindo' :
        '<br />Descendo'
    ) : '')
  }
  
  function updateButtons() {
    buttons.forEach(button => {
      if (destinyFloors.find(df => df.getAttribute("data-floor") == button.getAttribute("data-set-floor"))) {
        button.classList.add("active")
      } else {
        button.classList.remove("active")
      }
    })
  }
}
!
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