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HTML

              
                <div class="container">
    <div class="no-face">

      <div class="face">
        <div class="eyes-container">
          <div class="left eye-container">
            <div class="mark mark-top"></div>
            <div class="eye"></div>
            <div class="eyebag"></div>
            <div class="mark mark-bottom"></div>
          </div>
          <div class="right eye-container">
            <div class="mark mark-top"></div>
            <div class="eye"></div>
            <div class="eyebag"></div>
            <div class="mark mark-bottom"></div>
          </div>
        </div>
        <div class="mouth-container">
          <div class="mouth"></div>
          <div class="chin"></div>
        </div>
      </div>

      <div class="real-mouth">
        <div class="real-mouth-top">
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
        </div>
        <div class="real-mouth-bottom">
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
          <div class="teeth"></div>
        </div>
      </div>

      <div class="end">
      </div>

    </div>
    <div class="bird-and-mouse">
      <div class="bird">
        <div class="eyes-container">
          <div class="left eye"></div>
          <div class="right eye"></div>
        </div>
        <div class="beak-container">
          <div class="left prepart"></div>
          <div class="right prepart"></div>
          <div class="left part"></div>
          <div class="right part"></div>
        </div>
        <div class="legs-container">
          <div class="left leg"></div>
          <div class="right leg"></div>
        </div>
        <div class="left wing"></div>
        <div class="right wing"></div>
      </div>
      <div class="mouse">
        <div class="head-container">
          <div class="left ear"></div>
          <div class="head-top"></div>
          <div class="right ear"></div>
          <div class="cheek-container">
            <div class="left cheek"></div>
            <div class="right cheek"></div>
          </div>
        </div>
        <div class="face">
          <div class="eyes-container">
            <div class="left eye"></div>
            <div class="right eye"></div>
          </div>
          <div class="nose"></div>
        </div>
        <div class="body-container">
          <div class="hands-container">
            <div class="left hand"></div>
            <div class="right hand"></div>
          </div>
          <div class="body"></div>
        </div>
      </div>
    </div>
    <div class="shadow"></div>
  </div>

<div class="created">
  <span>Created by</span>
  <a href="https://manz.dev/"><h2>Manz.dev</h2></a>
  <p>on <a href="https://twitch.tv/ManzDev">Twitch</a> / <a href="https://youtu.be/JGOQk6cqBaE">Youtube</a></p>
</div>
              
            
!

CSS

              
                @use postcss-nested;

:root {
  --no-face-color: #222;
  --no-face-gradient: linear-gradient(to bottom, #222 40%, #222e 60%, #2229 80%, transparent 100%);
  --no-face-shadow: #888;
  --no-face-width: 175px;
  --no-face-height: 400px;
  --mark-color: #876f83;
  --mouse-color: #cfbab5;
  --mouse-shadow: #b9a6a2;
  --custom-filter: drop-shadow(2px 0 0 var(--mouse-shadow)) drop-shadow(0 2px 0 var(--mouse-shadow)) drop-shadow(-2px 0 0 var(--mouse-shadow)) drop-shadow(0 -2px 0 var(--mouse-shadow));
}

.container {
  display: flex;
  justify-content: center;
  margin-top: 2em;
}

.no-face {
  background: var(--no-face-gradient);
  width: var(--no-face-width);
  height: var(--no-face-height);
  border-radius: 45% 45% 0 0 / 20% 20% 0 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  filter: drop-shadow(0 0 2px #5f3399) drop-shadow(0 0 5px #391469) drop-shadow(0 0 15px #270850);

  & .face {
    width: 125px;
    height: 175px;
    margin-top: 20px;
    border-radius: 50% 50% 44% 44% / 30% 30% 44% 44%;
    background: #fff;

    & .eyes-container {
      width: 110px;
      height: 110px;
      margin: auto;
      display: flex;
      justify-content: space-between;

      & .eye-container {
        width: 45px;
        height: 90px;
        transform: translateY(20px);
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        align-items: center;

        &.right {
          transform: translateY(20px) scaleX(-1);
        }

        & .mark {
          background: var(--mark-color);
        }

        & .mark-top {
          width: 10px;
          height: 22px;
          border-radius: 100% 100% 40% 40% / 200% 200% 25% 25%;
          transform: translateX(5px);
        }

        & .eye {
          width: 30px;
          height: 11px;
          background: var(--no-face-color);
          border-radius: 50%;
        }

        & .eyebag {
          width: 30px;
          height: 11px;
          background: var(--no-face-shadow);
          border-radius: 50%;
          clip-path: polygon(0 50%, 100% 50%, 100% 100%, 0 100%);
        }

        & .mark-bottom {
          width: 18px;
          height: 35px;
          border-radius: 50% 50% 100% 100% / 45% 45% 150% 150%;
        }
      }
    }

    & .mouth-container {
      width: 100px;
      height: 40px;
      margin: auto;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      align-items: center;

      & .mouth {
        width: 55px;
        height: 22px;
        background: var(--no-face-color);
        border-radius: 50%;
        clip-path: polygon(0 50%, 100% 50%, 100% 100%, 0 100%);
      }

      & .chin {
        width: 25px;
        height: 8px;
        background: var(--no-face-shadow);
        border-radius: 50%;
        clip-path: polygon(0 50%, 100% 50%, 100% 100%, 0 100%);
      }
    }
  }

  & .real-mouth {
    background: darkred;
    width: 175px;
    display: block;
    height: 0;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;

    &.bite {
      display: flex;
      animation: moveMouth 0.15s ease-out infinite alternate-reverse;
    }

    &.opened {
      display: flex;
      height: 123px;
    }

    & .real-mouth-top,
    & .real-mouth-bottom {
      display: flex;
    }

    & .teeth {
      width: 25px;
      height: 30px;
      background: #fff;
    }

    & .real-mouth-top .teeth {
      border-top: 6px solid red;
      border-radius: 0 0 50% 50% / 0 0 40% 40%;
    }

    & .real-mouth-bottom .teeth {
      border-bottom: 6px solid red;
      border-radius: 50% 50% 0 0 / 40% 40% 0 0;
    }
  }

  & .end {
    width: 100%;
    height: 50px;
  }
}

@keyframes moveMouth {
  0% {
    height: 73px;
  }

  100% {
    height: 123px;
  }
}

.mouse {
  width: 110px;
  height: 135px;
  transform: translateY(50px);

  & .head-container {
    width: 75px;
    height: 75px;
    margin: auto;
    filter: var(--custom-filter);
    position: relative;
    z-index: 5;

    & .ear {
      position: absolute;
      width: 15px;
      height: 30px;
      background: #82627c;
      border-radius: 50% 0 0 50% / 70% 0 0 20%;

      &.left {
        transform: translate(10px, -5px) rotate(-25deg);
      }

      &.right {
        transform: translate(50px, -65px) rotate(25deg) scaleX(-1);
      }
    }

    & .head-top {
      width: 60px;
      height: 60px;
      margin: auto;
      border-radius: 50%;
      background: var(--mouse-color);
      position: relative;
      z-index: 2;
      transform: translateY(3px);
    }

    & .cheek-container {
      display: flex;
      transform: translate(0, -2px);
    }

    & .cheek {
      position: absolute;
      display: inline-block;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--mouse-color);

      &.left {
        transform: translate(0, -25px);
      }

      &.right {
        transform: translate(35px, -25px);
      }
    }
  }

  & .face {
    position: absolute;
    z-index: 5;
    width: 45px;
    transform: translate(32px, -50px);
    display: flex;
    flex-direction: column;
    align-items: center;

    & .eyes-container {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }

    & .eye {
      background: #fff;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      display: flex;
      justify-content: center;

      &::after {
        content: "";
        display: block;
        background: #111;
        border-radius: 50%;
        width: 8px;
        height: 8px;
        transform: translateY(1px);
      }
    }

    & .nose {
      width: 6px;
      height: 6px;
      background: #604552;
      border-radius: 50%;
    }
  }

  & .body-container {
    width: 100px;
    height: 70px;
    background: var(--mouse-color);
    border: 2px solid var(--mouse-shadow);
    border-radius: 30% 30% 50px 50px / 100px 100px 20px 20px;
    transform: translate(5px, -10px) rotateX(15deg);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    overflow: hidden;

    & .hands-container {
      width: 35px;
      height: 25px;
      display: flex;
      justify-content: space-between;
      position: absolute;
      transform: translateY(14px);

      & .hand {
        display: flex;

        &::before,
        &::after {
          content: "";
          display: block;
          width: 2px;
          height: 100%;
          background: var(--mouse-shadow);
        }

        &::after {
          transform: translate(-11px, 2px) rotate(-45deg);
        }

        &.right {
          transform: scaleX(-1);
        }
      }
    }

    & .body {
      background: #fff;
      width: 70px;
      height: 70px;
      border-radius: 50%;
      transform: translateY(35px);
    }
  }
}

.bird-and-mouse {
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: flyLittleFriends 1.25s ease infinite alternate;
}

.bird {
  position: absolute;
  background: #222;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  transform: translateY(-10px);
  display: flex;
  flex-direction: column;
  align-items: center;

  & .eyes-container {
    display: flex;
    width: 100%;
    justify-content: space-evenly;
    align-items: center;
    transform: translate(0, 14px);

    & .eye {
      background: #fff;
      border-radius: 50%;
      width: 12px;
      height: 12px;
      display: flex;
      justify-content: center;
      align-items: center;

      &::before {
        content: "";
        display: block;
        width: 5px;
        height: 5px;
        border-radius: 50%;
        background: #111;
        transform: translate(1px, -1px);
      }
    }
  }

  & .beak-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: 0.5fr 1.5fr;
    width: 30px;
    height: 35px;
    transform: translate(0, 10px);

    & .prepart,
    & .part {
      background: #fcac4d;
      border-bottom: 1px solid #fcac4d;
    }

    & .prepart {
      clip-path: polygon(100% 0, 100% 100%, 0 100%);
      transform: translateY(1px);

      &.right {
        transform: translate(-1px, 1px) scaleX(-1);
      }
    }

    & .part {
      clip-path: polygon(0 0, 100% 0, 100% 100%);

      &.right {
        transform: translateX(-1px) scaleX(-1);
      }
    }
  }

  & .legs-container {
    display: flex;

    & .leg {
      position: absolute;
      height: 30px;
      border-left: 3px solid #111;
      z-index: -1;

      &.left {
        transform: translate(-11px, -10px) rotate(-20deg);
      }

      &.right {
        transform: translate(7px, -10px) rotate(20deg);
      }
    }
  }

  & .wing {
    width: 24px;
    height: 8px;
    border-radius: 45%;
    background: #111;
    position: absolute;
    top: 18px;

    &.left {
      left: -27px;
      animation: moveWings 0.15s linear infinite;
    }

    &.right {
      left: 48px;
      animation: moveWingsRight 0.15s linear infinite;
    }
  }
}

@keyframes flyLittleFriends {
  0% {
    transform: translate(20px, 0);
  }

  100% {
    transform: translate(20px, 20px);
  }
}

@keyframes moveWings {

  0%,
  100% {
    transform: translateY(-25px) rotate(55deg);
  }

  33% {
    transform: translateY(0) rotate(0deg);
  }

  66% {
    transform: translateY(25px) rotate(-55deg);
  }
}

@keyframes moveWingsRight {

  0%,
  100% {
    transform: translateY(-25px) rotate(-55deg);
  }

  33% {
    transform: translateY(0) rotate(0deg);
  }

  66% {
    transform: translateY(25px) rotate(55deg);
  }
}

.shadow {
  background: rgba(0, 0, 0, 0.3);
  width: 65px;
  height: 15px;
  filter: blur(2px);
  border-radius: 50%;
  position: absolute;
  top: 520px;
  animation: animatedShadow 1.25s ease infinite alternate;
}

@keyframes animatedShadow {
  0% {
    transform: translate(115px, -85px) scale(0.8);
  }

  100% {
    transform: translate(115px, -85px) scale(1);
  }
}

.created {
  background: 
    url(https://assets.codepen.io/154065/internal/avatars/users/default.png),
    linear-gradient(to bottom, #884ced, #ec1cce);
  background-size: 75px 75px, cover;
  background-repeat: no-repeat;
  position: absolute;
  top: 0;
  right: 0;
  width: 250px;
  height: 75px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-left: 2em;
  
  & span,
  & h2,
  & p,
  & a {
    font-family: Montserrat;
    margin: 0;
  }
  
  & a,
  & p,
  & span {
    color: #fff;    
  }
  
  & h2 {
    font-weight: 700;
    transform: translate(0, -4px);    
  }
  
  & a {
    text-decoration-color: rgba(255,255,255,0.4);
  }
  
  & a:hover {
    color: #e6e82a;
  }
}
              
            
!

JS

              
                const WAIT_TIME = 30000;
const realMouth = document.querySelector(".real-mouth");

const enableBite = () => {
  realMouth.classList.add("bite");
  const timeToEnd = (Math.floor(Math.random() * 5) * 1000) + 3000;
  const timeToStart = (Math.floor(Math.random() * 5) * 1000) + WAIT_TIME;
  setTimeout(() => disableBite(), timeToEnd);
  setTimeout(() => enableBite(), timeToEnd + 10000 + timeToStart);
};
const disableBite = () => realMouth.classList.remove("bite");

const timeToStart = (~~(Math.random() * 5) * 1000) + 3000;

setTimeout(() => enableBite(), timeToStart);
              
            
!
999px

Console