<div class="container">
  
  <div class="flame-wrapper">
      <div class="flame red"></div>
      <div class="flame orange"></div>
      <div class="flame gold"></div>
      <div class="flame white"></div>
      <div class="base blue"></div>
      <div class="base black"></div>
  </div>
  <div class="source">
      <a href="https://redstapler.co/easy-realistic-css-fire-effect/">source RED STAPLER</a>
  </div>
  
</div>

body {
  background-color: black;
  color: #fff;
}
.container {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

.source {
  text-align: right;
  width: 100%;
}

.source a {
  color: #c2c2c2;
  font-size: .7rem;
  text-decoration: none;
}

.red {
    width: 80px;
    height: 80px;
    background: orangered;
  box-shadow: 0px 0px 10px 5px orangered;
}
.orange {
    width: 60px;
    height: 60px;
  left: 10px;
    background: orange;
  box-shadow: 0px 0px 12px 6px orange;
}
.gold {
    width: 45px;
    height: 45px;
    background: gold;
  left:18px;
  box-shadow: 0px 0px 9px 4px gold;
}
.white {
  width: 35px;
  height: 35px;
  background: lightyellow;
  left:23px;
  box-shadow: 0px 0px 9px 4px lightyellow;
}
.blue {
   width: 15px;
   height: 15px;
   background: darkblue;
   left: 32px;
   box-shadow: 0px 0px 15px 10px darkblue;
}
.black {
  width: 40px;
  height: 40px;
  background: black;
  bottom: -50px;
  left: 20px;
  box-shadow: 0px 0px 15px 10px black;
}
.base {
  border-radius: 50%;
  position: absolute;
}
.flame-wrapper {
  position: relative;
  margin: auto;
  animation: flicker .1s ease-in infinite;
}
.flame {
  bottom: 0;
  position: absolute;
  border-radius: 50% 0% 50% 50%;
  transform: rotate(-45deg);
}

@keyframes flicker {
    0% {transform: rotate(-1deg);}
    20% {transform: rotate(2deg) scaleY(1.05);}
    40% {transform: rotate(-1deg);}
    60% {transform: rotate(1deg);}
    80% {transform: rotate(-1deg) scaleY(0.90);}
    100% {transform: rotate(1deg);}
}