<div class="cat">
  <div class="ear ear--left"></div>
  <div class="ear ear--right"></div>
  <div class="face">
    <div class="eye eye--left">
      <div class="eye-pupil"></div>
    </div>
    <div class="eye eye--right">
      <div class="eye-pupil"></div>
    </div>
    <div class="muzzle"></div>
  </div>
</div>

$color-black: #161616;
$color-white: #fff;
$size: 170px; // (Fully responsive)

// Cat
.cat {
  position: relative;
  height: $size;
  width: $size * 1.13;
}

// Ears
.ear {
  position: absolute;
  top: -30%;
  height: 60%;
  width: 25%;
  background: $color-white;
  
  // Ear hair
  &::before,
  &::after {
    content: '';
    position: absolute;
    bottom: 24%;
    height: 10%;
    width: 5%;
    border-radius: 50%;
    background: $color-black;
  }
  
  &::after {
    transform-origin: 50% 100%;
  }
}

.ear--left {
  left: -7%;
  border-radius: 70% 30% 0% 0% / 100% 100% 0% 0%;
  transform: rotate(-15deg);
  
  &::before,
  &::after {
    right: 10%;
  }
  
  &::after {
    transform: rotate(-45deg);
  }
}

.ear--right {
  right: -7%;
  border-radius: 30% 70% 0% 0% / 100% 100% 0% 0%;
  transform: rotate(15deg);
  
  &::before,
  &::after {
    left: 10%;
  }
  
  &::after {
    transform: rotate(45deg);
  }
}

// Face
.face {
  position: absolute;
  height: 100%;
  width: 100%;
  background: $color-black;
  border-radius: 50%;
}

// Eyes
.eye {
  position: absolute;
  top: 35%;
  height: 30%;
  width: 31%;
  background: $color-white;
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  
  // Eyelids
  &::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 0;
    width: 100%;
    border-radius: 0 0 50% 50% / 0 0 40% 40%;
    background: $color-black;
    animation: blink 4s infinite ease-in;
  }
  
  @keyframes blink {
    0% { height: 0; }
    90% { height: 0; }
    92.5% { height: 100%; }
    95% { height: 0; }
    97.5% { height: 100%; }
    100% { height: 0; }
  }
  
  // Tips of the eyes
  &::before {
    content: '';
    position: absolute;
    top: 60%;
    height: 10%;
    width: 15%;
    background: $color-white;
    border-radius: 50%;
  }
}

.eye--left {
  left: 0;
  
  &::before {
    right: -5%;
  }
}

.eye--right {
  right: 0;
  
  &::before {
    left: -5%;
  }
}

// Pupils
.eye-pupil {
  position: absolute;
  top: 25%;
  height: 50%;
  width: 20%;
  background: $color-black;
  border-radius: 50%;
  animation: look-around 4s infinite;
  
  @keyframes look-around {
    0% { transform: translate(0) }
    5% { transform: translate(50%, -25%) }
    10% { transform: translate(50%, -25%) }
    15% { transform: translate(-100%, -25%) }
    20% { transform: translate(-100%, -25%) }
    25% { transform: translate(0, 0) }
    100% { transform: translate(0, 0) }
  }
  
  .eye--left & {
    right: 30%;
  }
  
  .eye--right & {
    left: 30%;
  }
  
  // Glare on the pupil
  &::after {
    content: '';
    position: absolute;
    top: 30%;
    right: -5%;
    height: 20%;
    width: 35%;
    border-radius: 50%;
    background: $color-white;
  }
}

// Muzzle
.muzzle {
  position: absolute;
  top: 60%;
  left: 50%;
  height: 6%;
  width: 10%;
  background: $color-white;
  transform: translateX(-50%);
  border-radius: 50% 50% 50% 50% / 30% 30% 70% 70%;
}

/* General page styling */
html {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: $color-black;
}