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HTML 

              
                <main>
  <section class="advice">
    <h1 class="advice__title">Site under construction or maintenance </h1>
    <p class="advice__description"><span><</span> building <span>/></span> not finished yet</p>
  </section>
  <section class="city-stuff">
    <ul class="skyscrappers__list">
      <li class="skyscrapper__item skyscrapper-1"></li>
      <li class="skyscrapper__item skyscrapper-2"></li>
      <li class="skyscrapper__item skyscrapper-3"></li>
      <li class="skyscrapper__item skyscrapper-4"></li>
      <li class="skyscrapper__item skyscrapper-5"></li>
    </ul>
    <ul class="tree__container">
      <li class="tree__list">
        <ul class="tree__item tree-1">
          <li class="tree__trunk"></li>
          <li class="tree__leaves"></li>
        </ul>
        <ul class="tree__item tree-2">
          <li class="tree__trunk"></li>
          <li class="tree__leaves"></li>
        </ul>
        <ul class="tree__item tree-3">
          <li class="tree__trunk"></li>
          <li class="tree__leaves"></li>
        </ul>  
        <ul class="tree__item tree-4">
          <li class="tree__trunk"></li>
          <li class="tree__leaves"></li>
        </ul>  
        <ul class="tree__item tree-5">
          <li class="tree__trunk"></li>
          <li class="tree__leaves"></li>
        </ul>  
        <ul class="tree__item tree-6">
          <li class="tree__trunk"></li>
          <li class="tree__leaves"></li>
        </ul>  
        <ul class="tree__item tree-7">
          <li class="tree__trunk"></li>
          <li class="tree__leaves"></li>
        </ul>  
        <ul class="tree__item tree-8">
          <li class="tree__trunk"></li>
          <li class="tree__leaves"></li>
        </ul>  
      </li>
    </ul>
    <ul class="crane__list crane-1">
      <li class="crane__item crane-cable crane-cable-1"></li>
      <li class="crane__item crane-cable crane-cable-2"></li>
      <li class="crane__item crane-cable crane-cable-3"></li>
      <li class="crane__item crane-stand"></li>
      <li class="crane__item crane-weight"></li>
      <li class="crane__item crane-cabin"></li>
      <li class="crane__item crane-arm"></li>
    </ul>
    <ul class="crane__list crane-2">
      <li class="crane__item crane-cable crane-cable-1"></li>
      <li class="crane__item crane-cable crane-cable-2"></li>
      <li class="crane__item crane-cable crane-cable-3"></li>
      <li class="crane__item crane-stand"></li>
      <li class="crane__item crane-weight"></li>
      <li class="crane__item crane-cabin"></li>
      <li class="crane__item crane-arm"></li>
    </ul>
    <ul class="crane__list crane-3">
      <li class="crane__item crane-cable crane-cable-1"></li>
      <li class="crane__item crane-cable crane-cable-2"></li>
      <li class="crane__item crane-cable crane-cable-3"></li>
      <li class="crane__item crane-stand"></li>
      <li class="crane__item crane-weight"></li>
      <li class="crane__item crane-cabin"></li>
      <li class="crane__item crane-arm"></li>
    </ul>
  </section>
</main>
!

CSS 

              
                // Variables
$c-main: hsla(0, 100%, 100%, .75);
$c-secondary: hsla(200, 5%, 11%, 1);
$c-malabars: hsla(178, 40%, 49%, 1);
$c-trunk: hsla(23, 18%, 29%, 1);
$c-white: hsla(0, 255%, 255%, 1);
$bg-main: hsla(210, 3%, 15%, 1);
$city-skyscrappers: 5;
$city-cranes: 3;
$city-trees: 8;
$crane-width: 260px;
$crane-height: $crane-width / 1.5;
$crane-border: 1px;
$trunk-height: 8px;
$media900: 900px;
$media768: 768px;
$media450: 450px;

// Fonts
@import url('https://fonts.googleapis.com/css?family=Josefin+Sans');

// General
* {
  box-sizing: border-box;
}

main {
  position: relative;
  height: 100vh;
  z-index: -10;
  background: linear-gradient(to top, $c-secondary, $c-main);
}

body {
  font-size: 12px; // 1rem=12px
  font-family: 'Josefin Sans', 'Roboto', sans-serif;
  color: $c-main;
  overflow: hidden;
  background-color: $bg-main;
}

// Specific
.crane__list,
.skyscrappers__list,
.tree__container {
  position: absolute;
  width: 100%;
  bottom: 0;
}

.advice {
  display: flex;
  height: 50vh; // Ensures that the text doesn't overlap the buildings until a weird aspect ratio occurs
  width: 100vw;
  flex-flow: column nowrap;
  justify-content: center;
  align-items: center;
  &__title {
    font-size: 3rem;
    text-align: center;
  }
  &__description {
    margin-top: 1rem;
    font-size: 2rem;
    text-align: center;
    span:first-child {
      margin-right: -.7rem;
    }
    span:last-child {
      margin-left: -.7rem;
    }
  }
}

.city-stuff {
  display: flex;
  position: absolute;
  justify-content: center;
  width: 100%;
  height: 100%;
  bottom: 0;
  overflow: hidden;
  box-shadow: inset 0 -60px 0 -30px $c-malabars;
}

.skyscrappers__list {
  width: 100%;
  height: $crane-height / 2;
  left: 0;
  .skyscrapper__item {
    position: absolute;
    height: inherit;
    bottom: 15%;
    width: $crane-height / 4;
    background: linear-gradient(115deg, $c-malabars 73%, darken($c-malabars, 10%) 73%, darken($c-malabars, 10%) 100%);
    &::after {
      content: '';
      position: absolute;
      width: 80%;
      height: 80%;
      left: 10%;
      bottom: 10%;
      background: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAAGCAYAAAAG5SQMAAAAFElEQVQImWP4////fwYYIJKDEwAAfPsP8eFXG40AAAAASUVORK5CYII=') space;
    }
    &:last-child:not(:only-child) { // Dynamic last-child pseudo-class selector (if it's desired to add new buildings)
      background: $c-malabars;
    }
  }
  @for $i from 1 through $city-skyscrappers {
    .skyscrapper-#{$i} {
      width: $crane-height / ($i / .7); //Building's width
      height: $crane-height / ($i / .8); //Building's height
      right: (15 + ($i * 10)) * 1%; // Building positioning and workaround to add units to SCSS calculation
      bottom: 0;
      z-index: 10;
      transform: rotate(180deg);
      // Minor SCSS changes to make buildings more unpredictable
      @if $i == 2 {
        bottom: 10%;
        @media screen and (max-width: $media900) { 
          display: none;
        }
      }
      @if $i == 3 {
        height: $crane-height / ($i / 2);
        @media screen and (max-width: $media900) { 
          display: none;
        }
      }
      @if $i == 4 {
        height: $crane-height / ($i / 2);
        &::after {
          width: 20%;
          height: 60%;
          left: 25%;
        }
      }
      @if $i == 5 {
        width: 7%;
        right: 67%;
        height: 50%;
        z-index: 11;
        &::after {
          height: 0;
        }
      }
    }
    @media screen and (max-width: $media450) { 
      .skyscrapper-1{
        display: none;
      }
    }
  }
}

.crane-cabin, .crane-arm, .crane-picker {
  transform-origin: 80% center;
  animation: crane__movement 12s infinite alternate;
}

.crane__list {
  width: $crane-width;
  height: $crane-height;
  z-index: 0;
  perspective: 600px;
  .crane__item {
    position: absolute;
    border: solid 1px $c-malabars;
    border-radius: 2px;
  }
  .crane-cable {
    width: 1px;
    height: 1px;
    border: none;
    outline: 1px solid transparent;
    background: $c-malabars;
    z-index: 0;
  }
  .crane-cable-1 {
    width: 60%;
    top: 0;
    left: 11%;
    transform-origin: right 0;
    animation: cable-1__movement 12s infinite alternate;
  }
  .crane-cable-2 {
    width: 19%;
    top: 0;
    right: 8%;
    transform-origin: top left;
    animation: cable-2__movement 12s infinite alternate;
  }
  .crane-cable-3 {
    height: 30%;
    top: 22%;
    left: 9%;
    transform-origin: right center;
    animation: cable-3__movement 12s ease-in-out infinite alternate;
    &::after {
      content: '';
      display: block;
      position: absolute;
      height: .2em;
      width: 9000%;
      bottom: 0;
      left: -4500%;
      background: lighten($c-malabars, 20%);
      border: $crane-border solid $c-malabars;
    }
  }
  .crane-stand {
    width: 5%;
    height: 100%;
    right: 25%;
    z-index: 1;
    background: linear-gradient(to top, $c-malabars, desaturate(lighten($c-malabars, 30%), 20%));
  }
  .crane-weight {
    width: 8%;
    height: 20%;
    right: 4%;
    top: 12%;
    z-index: 2;
    background: desaturate(lighten($c-malabars, 25%), 10%);
    transform-origin: 0 center;
    animation: crane-weight__movement 12s infinite alternate;
  }
  .crane-cabin {
    width: 12%;
    height: 9%;
    right: 24%;
    top: 20%;
    z-index: 2;
    background: desaturate(lighten($c-malabars, 25%), 10%);
    &::after {
      content: '';
      display: block;
      position: absolute;
      width: 100%;
      height: 10%;
      top: 60%;
      left: 0;
      background: $c-white;
    }
  }
  .crane-arm {
    width: 100%;
    height: 7%;
    top: 15%;
    border-top-left-radius: 10px;
    z-index: 3;
    background: desaturate(lighten($c-malabars, 25%), 10%);
  }
}

@for $i from 1 through $city-cranes {
  .crane-#{$i} {
    left: 10 + $i * 10 * 1%; //Crane positioning
    z-index: 10;
    @if $i == 2 {
      bottom: -1rem;
      z-index: -1;
      transform: scale(.75) scaleX(-1); // Mirror and scale effect to simulate a far crane
      @media screen and (max-width: $media900) { 
        display: none;
      }
    }
    @if $i == 3 {
      bottom: -.5rem;
      transform: scale(.8);
      @media screen and (max-width: $media900) { 
        z-index: -1;
        transform: scale(.75) scaleX(-1);
      }
      @media screen and (max-width: $media900) { 
        display: none;
      }
    }
    @if $i > 1 {
      .crane-cable-3 {
        animation-delay: $i * 1.5s;
      }
    }
  }
}

.tree__container {
  width: 100%;
  height: $crane-height / 2 - $trunk-height * 3;
  left: 0;
  margin-bottom: $trunk-height / 2;
}

.tree__item {
  display: flex;
  flex-flow: column nowrap;
  position: absolute;
  justify-content: flex-end;
  align-items: center;
  left: 60%;
}

.tree__trunk {
  order: 2;
  display: block;
  position: absolute;
  width: $trunk-height / 2;
  height: $trunk-height;
  margin-top: $trunk-height;
  border-radius: 2px;
  background: $c-trunk;
}

.tree__leaves {
  order: 1;
  position: relative;
  border-top: 0 solid transparent;
  border-right: 4px solid transparent;
  border-bottom: $trunk-height * 4 solid $c-malabars;
  border-left: 4px solid transparent;
  &::after {
    content: '';
    position: absolute;
    height: 100%;
    left: -4px;
    border-top: 0;
    border-right: 0;
    border-bottom: $trunk-height * 4 solid darken($c-malabars, 10%);
    border-left: 4px solid transparent;
  }
}

@for $i from 1 through $city-trees {
  .tree-#{$i} {
    @if $i <= 2 {
      left: 65% + $i; //Tree positioning
      @media screen and (max-width: $media768) { 
        display: none
      }
    }
    @if $i > 3 and $i < 6 {
      left: 53% + $i;

    }
    @if $i > 6 {
      left: 44% + $i;
      @media screen and (max-width: $media450) { 
        display: none
      }
    }
  }
}

// Animations
@keyframes cable-1__movement {
  0%, 20% {
    transform: rotateY(0) rotateZ(-10deg);
  }
  70%, 100% {
    transform: rotateY(45deg) rotateZ(-10deg);
  }
}

@keyframes cable-2__movement {
  0%, 20% {
    transform: rotateY(0) rotateZ(29deg);
  }
  70%, 100% {
    transform: rotateY(15deg) rotateZ(29deg);
  }
}

@keyframes cable-3__movement {
  0% {
    transform: translate(0, 0);
  }
  20% {
    transform: translate(2500%, -18%);
  }
  60% {
    transform: translate(11000%, -25%);
  }
  70% {
    height: 30%;
    transform: translate(9100%, -25%);
  }
  90%, 100% {
    height: 80%;
    transform: translate(9100%, -15%);
  }
}

@keyframes crane__movement {
  0%, 20% {
    transform: rotateY(0);
  }
  70%, 100% {
    transform: rotateY(45deg);
  }
}

@keyframes crane-weight__movement {
  0%, 20% {
    transform: rotateY(0) translateX(0);
  }
  70%, 100% {
    transform: rotateY(45deg) translateX(-50%);
  }
}
!

JS 

              
                // ¯\_(ツ)_/¯ I told you that there was no JS
!
999px

Console