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HTML 

              
                <html>
  
  <head>
  </head>

<body>
 <h1 class="title">Merry Christmas</h1>
 <!-- Begin Image -->
 <!-- Invisible Box-->
 <div class="box">
   
   <!-- mountains -->
   <div class="mountains mountains-1"></div>
   <div class="mountains mountains-2"></div>
   <div class="mountains mountains-3"></div>
    
   <!-- house -->
   <div class="house">
     <div class="door"></div>
     <div class="window window-1"></div>
     <div class="window window-2"></div>
     <div class="window window-3"></div>
     <div class="window window-4"></div>
     <div class="window window-5"></div>
   </div>
   <div class="roof">
     <div class="chimney"></div>
   </div>
   <div class="sun"></div>
   
   <!-- tree -->
   <div class="tree tree-0"></div>
   <div class="tree tree-1"></div>
   <div class="tree tree-2"></div>
   <div class="tree tree-3"></div>
   <div class="tree tree-4"></div>
   <div class="tree tree-5"></div>
   <div class="tree tree-down"></div>
   <div class="tree star"></div>
   
   <!-- little human -->
   <div class="human-head"></div>
   <div class="human-body"></div>
   <div class="heartbeat"></div>
   <div class="human-hands"></div>
   <div class="human-leg-left"></div>
   <div class="human-leg-right"></div>
   <div class="human-cup"></div>
   
 </div> <!-- End Invisible Box -->
  
  
  <div> <!-- for footer -->
      <h5 id="footer" class="title"><a href="http://www.eleftheriabatsou.com" target="_blank">Eleftheria</a> | <a href="https://blog.eleftheriabatsou.com/creating-a-christmas-scene" target="_blank">Tutorial</a> | <a href="https://www.youtube.com/channel/UCC-WwYv3DEW7Nkm_IP6VeQQ" target="_blank"> Coding videos </a></h5>
    </div> <!-- end footer -->
  
</body>
</html>
!

CSS 

              
                $black: #000;
$white: #fff;
$bg-color: #FFC0CB; //linear-gradient(120deg, #fccb90 0%, #d57eeb 100%);

$mountains: rgba(137, 43, 17, 0.8) ; //brown
$roof:#BC1818;//red
$door:#BC3C18; //red-brown
$house:#C1B5B2; //grey
$window:#D8D8D8; //light-grey
$sun:rgba(216, 216, 216, 0.3);
$star: rgba(255,235,59 ,0.8);
$human: #8A716A; //dark grey


.title{text-align: center;
font-family: "Mountains of Christmas"}

#footer a:link{color:black}
#footer a:visited{color:black}
#footer a:hover{color: $roof}

body{background: $bg-color;}

.box{  
  position: relative;
  margin: auto;
  display: block;
  /*optional background or border*/
  //border: solid 4px red;
  
  margin-top: 2%;
  width: 630px;
  height: 460px;
  background: none;
}

.mountains{
  position: absolute;
  background: $mountains;
  border-top: 25px solid white;
  //as it is from clippy tool
  -webkit-clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
  
  &.mountains-1{
    top: 5%;
    left: 25%;
    width: 55%;
    height: 85%;
 }
  &.mountains-2{
    top: 35%; 
    left: 15%;
    width: 25%;
    height: 55%;
  }
  &.mountains-3{
    top: 30%; 
    right: 5%;
    width: 35%;
    height: 60%;
  }  
}

.house{
  position: absolute;
  top: 65%;
  left: 35%;
  width: 32%;
  height: 35%;
  background: $house;
}

 .window{
  position: absolute; 
  width: 14%; 
  height: 20%;
  background: $window;
  
   &.window-1{
    top: 65%;
    left: 16%; 
    
    -webkit-animation: window-1 2s linear 1s infinite both;
	        animation: window-1 2s linear 1s infinite both;
  }
  &.window-2{
    top: 65%;
    right: 16%; 
    
    -webkit-animation: window-2 3s linear 1s infinite both;
	        animation: window-2 3s linear 1s infinite both;
  }
  &.window-3{
    top: 25%;
    left: 16%; 
  }
  &.window-4{
    top: 25%;
    right: 16%; 
  }
  &.window-5{
    top: 25%;
    left: 44%; 
    
    -webkit-animation: window-5 3s linear 2s infinite both;
	        animation: window-5 3s linear 2s infinite both;
  }
 }

.door{
  position: absolute;
  top: 65%;
  left: 44%; //35+9=44
  width: 14%; //32-14=18, 18/2=9
  height: 35%;
  background: $door;
}

.roof{
  position: absolute;
  top: 49%;
  left: 35%;
  width: 32%;
  height: 15%;
  background: $roof;
  border-top: 5px solid white;
  -webkit-clip-path: polygon(20% 0%, 80% 0%, 100% 100%, 0% 100%);
clip-path: polygon(20% 0%, 80% 0%, 100% 100%, 0% 100%);
}

.chimney{
  position: absolute;
  top: 32%;
  left: 72%;
  width: 6%;
  height: 35%;
  background: $mountains;
  border-top: 3px solid white;
}

.sun{
  position: absolute;
  top: -20%;
  left: 42%;
  width: 60%;
  height: 65%;
  background: $sun;
  border-radius: 45%;
}

.tree{
  position: absolute;
  height: 8%;
  -webkit-clip-path: polygon(20% 0%, 80% 0%, 100% 100%, 0% 100%);
clip-path: polygon(20% 0%, 80% 0%, 100% 100%, 0% 100%);
 
  &.tree-0{
    top: 50%; 
    left: 79%;
    width: 6%;
    background:rgba(220,237,200 ,0.5);
    
    -webkit-animation: tree-0 3s 1s ease-in-out infinite both;
	        animation: tree-0 3s 1s ease-in-out infinite both;
  }
  
  @-webkit-keyframes tree-0{
  0%,
  50%,
  100% {
    opacity: 1;
  }
  25%,
  75% {
    opacity: 0;
  }
}
@keyframes tree-0{
  0%,
  50%,
  100% {
    opacity: 1;
  }
  25%,
  75% {
    opacity: 0;
  }
}
  
  &.tree-1{
    top: 57%; 
    left: 78%;
    width: 8%;
    background:rgba(220,237,200 ,0.6);
    
    -webkit-animation: tree-1 3s 2s ease-in-out infinite both;
	        animation: tree-1 3s 2s ease-in-out infinite both;
  }
  
  @-webkit-keyframes tree-1{
  0%,
  50%,
  100% {
    opacity: 1;
  }
  25%,
  75% {
    opacity: 0;
  }
}
@keyframes tree-1{
  0%,
  50%,
  100% {
    opacity: 1;
  }
  25%,
  75% {
    opacity: 0;
  }
}
  
  &.tree-2{
    top: 64%; 
    left: 77%;
    width: 10%;
    background:rgba(174,213,129 ,0.6);
    
    -webkit-animation: tree-0 3s 3s ease-in-out infinite both;
	        animation: tree-0 3s 3s ease-in-out infinite both;
  }
  &.tree-3{
    top: 71%; 
    left: 76%;
    width: 12%;
    background:rgba(139,195,74 ,0.6);
    
    -webkit-animation: tree-1 3s 4s ease-in-out infinite both;
	        animation: tree-1 3s 4s ease-in-out infinite both;
  }
  &.tree-4{
    top: 78%; 
    left: 75%;
    width: 14%;
    background:rgba(104,159,56 ,0.6);
    
    -webkit-animation: tree-0 3s 5s ease-in-out infinite both;
	        animation: tree-0 3s 5s ease-in-out infinite both;
  }
  &.tree-5{
    top: 85%;
    left: 74%;
    width: 16%;
    background:rgba(51,105,30 ,0.6);
    
    -webkit-animation: tree-1 3s 6s ease-in-out infinite both;
	        animation: tree-1 3s 6s ease-in-out infinite both;
  }
  
  &.star{
    top: 45%;
    left: 79%;
    width:6%;
    background:$star;
        
    border-top: 6px solid white;
    //star is it is from the clippy tool
    -webkit-clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
  }
  
  &.tree-down{
    top: 92%;
    left: 79%;
    width:6%;
    background:$mountains;
  }
 }


//little-human
.human-head{
  position: absolute;
  top: 85%;
  left: 14%;
  width: 4%;
  height: 5%;
  border-radius: 50%;
  background: $human;
}
.human-body{
  position: absolute;
  top: 90%;
  left: 14%;
  width: 4%;
  height: 8%;
  border-radius: 40%;
  background: $human;
}
.heartbeat {
  position: absolute;
  top: 91%;
  left: 15.5%;
  width: 2%;
  height: 2%;
  border-radius: 40%;
  background: red;
  z-index: 1;
  -webkit-clip-path: polygon(54% 40%, 91% 1%, 81% 60%, 50% 100%, 24% 63%, 19% 0);
clip-path: polygon(54% 40%, 91% 1%, 81% 60%, 50% 100%, 24% 63%, 19% 0);
  
  -webkit-animation: heartbeat 1.5s ease-in-out infinite both;
	        animation: heartbeat 1.5s ease-in-out infinite both;
}

.human-hands{
  position: absolute;
  top: 90%;
  left: 12.8%;
  width: 5%;
  height:7%;
  border-radius: 20%;
  border: 4px solid $human;
  transform: rotate(45deg);
  background: none;
}
.human-leg-left{
  position: absolute;
  top: 96%;
  left: 14.2%;
  width: 1.6%;
  height:7%;
  border-radius: 20%;
  background: $human;
}
.human-leg-right{
  position: absolute;
  top: 96%;
  left: 16%;
  width: 1.6%;
  height:7%;
  border-radius: 20%;
  background: $human;
}

.human-cup{
  position: absolute;
  top: 81.5%;
  left: 14%;
  width: 4%;
  height:2%;
  border-radius: 40%;
  border-top: 6px solid white;
  border-bottom: 6px solid black;
  background: red;
  //z-index: -1;
  //penatgon
  -webkit-clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
}


@-webkit-keyframes heartbeat  {
  from {
    -webkit-transform: scale(1.1);
            transform: scale(1.1);
    -webkit-transform-origin: center center;
            transform-origin: center center;
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  10% {
    -webkit-transform: scale(0.91);
            transform: scale(0.91);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
  17% {
    -webkit-transform: scale(0.98);
            transform: scale(0.98);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  33% {
    -webkit-transform: scale(0.87);
            transform: scale(0.87);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
  45% {
    -webkit-transform: scale(1);
            transform: scale(1);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
}
@keyframes heartbeat {
  from {
    -webkit-transform: scale(1);
            transform: scale(1);
    -webkit-transform-origin: center center;
            transform-origin: center center;
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  10% {
    -webkit-transform: scale(0.91);
            transform: scale(0.91);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
  17% {
    -webkit-transform: scale(0.98);
            transform: scale(0.98);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  33% {
    -webkit-transform: scale(0.87);
            transform: scale(0.87);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
  45% {
    -webkit-transform: scale(1);
            transform: scale(1);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
}


//windows
@-webkit-keyframes window-1 {
  0%,
  100% {
    opacity: 1;
  }
  41.99% {
    opacity: 1;
  }
  42% {
    opacity: 0;
  }
  43% {
    opacity: 0;
  }
  43.01% {
    opacity: 1;
  }
  45.99% {
    opacity: 1;
  }
  46% {
    opacity: 0;
  }
  46.9% {
    opacity: 0;
  }
  46.91% {
    opacity: 1;
  }
  51.99% {
    opacity: 1;
  }
  52% {
    opacity: 0;
  }
  52.8% {
    opacity: 0;
  }
  52.81% {
    opacity: 1;
  }
}
@keyframes window-1 {
  0%,
  100% {
    opacity: 1;
  }
  41.99% {
    opacity: 1;
  }
  42% {
    opacity: 0;
  }
  43% {
    opacity: 0;
  }
  43.01% {
    opacity: 1;
  }
  45.99% {
    opacity: 1;
  }
  46% {
    opacity: 0;
  }
  46.9% {
    opacity: 0;
  }
  46.91% {
    opacity: 1;
  }
  51.99% {
    opacity: 1;
  }
  52% {
    opacity: 0;
  }
  52.8% {
    opacity: 0;
  }
  52.81% {
    opacity: 1;
  }
}



@-webkit-keyframes window-2 {
  0%,
  100% {
    opacity: 1;
  }
  41.99% {
    opacity: 1;
  }
  42% {
    opacity: 0;
  }
  43% {
    opacity: 0;
  }
  43.01% {
    opacity: 1;
  }
  45.99% {
    opacity: 1;
  }
  46% {
    opacity: 0;
  }
  46.9% {
    opacity: 0;
  }
  46.91% {
    opacity: 1;
  }
  51.99% {
    opacity: 1;
  }
  52% {
    opacity: 0;
  }
  52.8% {
    opacity: 0;
  }
  52.81% {
    opacity: 1;
  }
}
@keyframes window-2 {
  0%,
  100% {
    opacity: 1;
  }
  41.99% {
    opacity: 1;
  }
  42% {
    opacity: 0;
  }
  43% {
    opacity: 0;
  }
  43.01% {
    opacity: 1;
  }
  45.99% {
    opacity: 1;
  }
  46% {
    opacity: 0;
  }
  46.9% {
    opacity: 0;
  }
  46.91% {
    opacity: 1;
  }
  51.99% {
    opacity: 1;
  }
  52% {
    opacity: 0;
  }
  52.8% {
    opacity: 0;
  }
  52.81% {
    opacity: 1;
  }
}


@-webkit-keyframes window-5 {
  0%,
  100% {
    opacity: 1;
  }
  41.99% {
    opacity: 1;
  }
  42% {
    opacity: 0;
  }
  43% {
    opacity: 0;
  }
  43.01% {
    opacity: 1;
  }
  45.99% {
    opacity: 1;
  }
  46% {
    opacity: 0;
  }
  46.9% {
    opacity: 0;
  }
  46.91% {
    opacity: 1;
  }
  51.99% {
    opacity: 1;
  }
  52% {
    opacity: 0;
  }
  52.8% {
    opacity: 0;
  }
  52.81% {
    opacity: 1;
  }
}
@keyframes window-5 {
  0%,
  100% {
    opacity: 1;
  }
  41.99% {
    opacity: 1;
  }
  42% {
    opacity: 0;
  }
  43% {
    opacity: 0;
  }
  43.01% {
    opacity: 1;
  }
  45.99% {
    opacity: 1;
  }
  46% {
    opacity: 0;
  }
  46.9% {
    opacity: 0;
  }
  46.91% {
    opacity: 1;
  }
  51.99% {
    opacity: 1;
  }
  52% {
    opacity: 0;
  }
  52.8% {
    opacity: 0;
  }
  52.81% {
    opacity: 1;
  }
}
!

JS
!
999px

Console