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CSS

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HTML 

              
                 <div class="wing right"></div>
    <div class="wing left"></div>
     <div class="heart"></div>
        <div id="envelope">
       
  <div class="top"></div>
  
  <div class="sides"></div>
</div>
!

CSS 

              
                 body {
        margin:0;
        background:mistyrose;
    }

/* wings */

.wing {
    background:white;
     border-radius: 12px 20px 60px 20px;
     width:120px;
     height:50px; margin-top:80px;
     position:absolute;
}

/* right wing */

.right {
    margin-left:-60px;
    left:50%;
    animation:flap1 1s infinite;
    border-bottom:3px solid rgba(0,0,0,.08);
     border-radius: 12px 20px 60px 20px;
    transform:rotate(-10deg) translate(250px,0);
}

@keyframes flap1 {
    0% {
        transform:rotate(-10deg) translate(250px,0);
    }
    
    50% {
        transform:rotate(-5deg) translate(250px,0);
    }
}
.right:before {
    position:absolute;
    content:'';
    background:white;
    width:70%;
    height:70%;
       border-bottom:3px solid rgba(0,0,0,.08);
    border-radius: 20px 20px 60px 20px;
    transform:rotate(20deg) translate(-1px,0);
    margin-top:38px;
}

.right:after {
      position:absolute;
    content:'';
    background:white;
    width:40%;
    transform:rotate(29deg) translate(-8px,0);
    height:30%;
       border-bottom:3px solid rgba(0,0,0,.08);
    border-radius: 0px 0px 60px 70px;
    margin-top:66px;
}

/* left wing */

.left {
    border-radius:12px 20px 20px 60px;
     margin-left:-60px;
    left:50%;
     animation:flap2 1s infinite;
      border-bottom:3px solid rgba(0,0,0,.08);
    transform:rotate(10deg) translate(-248px, 0);
}

@keyframes flap2 {
    0% {
        transform:rotate(10deg) translate(-248px,0);
    }
    
    50% {
        transform:rotate(5deg) translate(-248px,0);
    }
}


.left:before {
    position:absolute;
    content:'';
    background:white;
    width:70%;
       border-bottom:3px solid rgba(0,0,0,.08);
    transform:translate(46%,0) rotate(-20deg);
    height:60%;
      border-radius:12px 20px 70px 70px;
    margin-top:40px;
}

.left:after {
      position:absolute;
    content:'';
    background:white;
    width:40%;
       border-bottom:3px solid rgba(0,0,0,.08);
    height:30%;
     transform:translate(164%,0) rotate(-34deg);
     border-radius:0px 0px 70px 60px;
    margin-top:58px;
}

/* heart */

.heart{
    position: absolute;
    width: 120px;
    z-index:99999;
    height: 100px;
    margin-left:-50px;
    left:50%;
     animation: heart 1s infinite;
    transform:scale(.8);
    transition:.6s;
    margin-top:60px;
    
}
.heart:before,
.heart:after{
    content: "";
    width: 50px;
    height: 80px;
    position: absolute;
    left: 50px;
    top: 0;
    border-radius: 50px 50px 6px 6px;
    background: crimson;
    transform: rotate(-45deg);
    transform-origin: 0 100%;
}
.heart:after{
    left: 0;
    transform: rotate(45deg);
    transform-origin :100% 100%;
}

@keyframes heart {
    0% {
        transform: scale(.8) translate(0,0);
    }
    
    50% {
        transform: scale(.92) translate(0, 12px);
    }
    
    100% {
        transform:scale(.8);
    }
}

/* envelope */

  #envelope {
  background: white; 
  margin: 200px auto;
  height: 200px;
  position: relative;
  width: 320px;
  border-radius:8px;
  overflow:hidden;
  animation: floaty 1s infinite;
}

@keyframes floaty {
    0% {
        transform:translate(0,0);
    }
    
    50% {
        transform:translate(0, 12px);
    }
}

/* bottom, left, and right sides */
.sides {
  border-color: transparent #fbfbfb #f7f7f7 #fcfcfc;
  border-style: solid;
  border-width: 90px 170px;
  bottom: 0;
  height: 0;
  left: 0;
  position: absolute;
  width: 0;
}

/* top side */

.top {
  border-color: white transparent transparent;
  border-style: solid;
  border-width: 108px 140px 90px 140px;
  height: 0;
  left: 0;
  position: absolute;
  top: 0;
  transform-origin: 50% 0;
  width: 0;
}
!

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