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HTML

              
                <section class="container">
  <section class="container-inner">
    <div class="svgbg">
      <!-- SVG -->
      <svg viewBox="0 0 875.88501 656.15442" xmlns="http://www.w3.org/2000/svg">
  <g class="fish">
    <path class="rear-finn" d="M447.86 606.577l.28.562c-41.918 89.377 57.398 128.87 64.157 131.436l.125.25c.03-.064.063-.124.094-.188.11.04.437.187.437.187l10.74-43.864c41.922-89.38-68.42-85.57-75.177-88.135l-.125-.25c-.03.064-.062.123-.092.187-.11-.04-.438-.187-.438-.187z" fill="coral" fill-rule="evenodd" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="5" transform="matrix(.8715 0 0 .8574 -11.782 -31.657)"/>
    <path class="tail" d="M879.42 146.35c32.525-29.2 98.488-61.128 136.65-64.25-66.304 53.08-66.485 85.228-73.308 129.95s-31.785 104.41-29.228 191.34c2.334 79.365 32.144 153.89 38.554 200.36s2.584 85.817 63.078 135.66c-37.25-2.303-119.38-45.23-133.51-58.795-55.168-52.97-35.343-128.25-25.104-171.91 17.702-75.49-25.09-44.893-39-98.25 13.91-53.358 55.867-26.254 39.282-100.53-8.57-38.376-32.233-114.37 22.58-163.58z" fill="coral" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="5" transform="matrix(.8715 0 0 .8574 -11.782 -31.657)"/>
    <path class="top-finn" d="M476.54 164.03c31.92-14.784 57.418-25.23 84.893-32.808s63.49-15.874 122.68-23.67c-60.114 47.205-57.4 67.512-37.792 104.92-11.006-5.393-38.82-20.01-67.303-26.895-34.763-8.404-51.818-7.263-79.346-7.457s-46.724 5.308-55.44 8.167c-8.02 2.63-3.92-4.207 32.314-22.257z" fill="coral" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="5" transform="matrix(.8715 0 0 .8574 -11.782 -31.657)"/>
    <path class="fish-face" d="M588.07 400.18c0 57.47-22.2 109.53-58.076 147.21s-97.634 60.568-123.29 60.885c-16.332.202-156.19-33.57-192.07-71.258-41.127-35.165-57.613-61.813-62.64-98.6-1.965-23.01 18.247-108.21 60.047-144.93 35.878-37.69 145.49-101.53 200.19-101.53s81.89 23.32 117.76 61.01 58.078 89.744 58.078 147.21z" fill="orange" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="5" transform="matrix(.8715 0 0 .8574 -11.782 -31.657)"/>
    <path class="fish-mouth" d="M375.59 325.14c100.45 203.24-219.75 122.9-219.75 122.9m205.41-115.09l26.262-13.7" fill="none" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="5" transform="matrix(.8715 0 0 .8574 -11.782 -31.657)"/>
    <path class="fish-body" d="M502.22 175.85c-34.267 0-66.994 5.684-97 15.945 96.538 33.01 164.81 113.77 164.81 208.12s-68.273 175.14-164.81 208.16c30.006 10.26 62.732 15.945 97 15.945 72.26 0 137.71-25.103 185.1-65.667 23.694-20.282 63.923-69.753 116.6-94.258s71.806-24.045 71.806-54.967-24.19-32.12-76.868-61.226-87.846-86.122-111.54-106.4c-47.387-40.556-112.84-65.652-185.1-65.652z" fill="#ff4500" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="5.006" transform="matrix(.8715 0 0 .8574 -11.782 -31.657)"/>
    <path class="front-finn" d="M634.72 775.1c-33.585 62.113-109.38-9.405-127.88-40.656-20.997-33.278-34.915-77.19 18-160.63 7.392-9.693-4.554-27.644 33.604-24.312 24.736 2.16 3.667 34.484 19.95 51.974 18.013 16.735 37.725 44.57 50.116 69.017 14.302 28.216 23.132 72.162 6.206 104.61z" fill="coral" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="5" transform="matrix(.8715 0 0 .8574 -11.782 -31.657)"/>
    <ellipse class="front-eye" cx="252.008" cy="215.161" rx="50" ry="50" stroke="#080A01" stroke-width="4" fill="#fff"/>
    <ellipse class="eye-pupil" transform="translate(-162.772 -21.21)" cx="415.531" cy="236.371" rx="15" ry="15"/>
    <ellipse class="bubble" cx="192.421" cy="83.529" rx="39.897" ry="31.224" fill="rgba(36,115,242, 0.5)"/>
    <ellipse class="bubble" cx="92.421" cy="43.529" rx="39.897" ry="31.224" fill="rgba(36,115,242, 0.8)"/>
    <ellipse class="bubble" cx="175.977" cy="67.617" rx="21.078" ry="18.067" fill="rgba(36,115,242, 0.5)"/>
    <ellipse class="bubble" cx="52.522" cy="106.762" rx="21.078" ry="19.572" fill="rgba(50,80,132, 0.6)"/>
    <ellipse class="bubble" cx="72.847" cy="121.064" rx="23.336" ry="20.325" fill="rgba(65,72,84, 0.8)"/>
    <ellipse class="bubble" cx="25.422" cy="166.984" rx="15.055" ry="15.055" fill="rgba(181,183,188, 0.5)"/>
    <ellipse class="bubble" cx="95.422" cy="266.984" rx="15.055" ry="15.055" fill="rgba(181,183,188, 0.3)"/>
    <ellipse class="bubble" cx="88.655" cy="206.881" rx="34.628" ry="30.864" fill="rgba(15,28,61, 0.7)"/>
    <ellipse class="bubble" cx="80.419" cy="320.214" rx="24.842" ry="23.336" fill="rgba(181,183,188, 0.8)"/>
  </g>
</svg>

    </div>
  </section>
  <div class="flex-container">
    <button class="btn btn-play">开始</button>
  </div>
</section>
              
            
!

CSS

              
                * {
  box-sizing: border-box;
}
*:after,
*:before {
  box-sizing: inherit;
}
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  font-size: 16px;
  line-height: 1.5;
  color: #333;
}
.container {
  width: 100%;
  max-width: 800px;
  height: 100vh;
  margin: 0 auto;
  position: relative;
}

.svgbg {
  overflow: hidden;
  background-color: #0246F4;
  border-radius: 50%;
  /* IE fix (Sara Soueidan: https://tympanus.net/Tutorials/ResponsiveSVGs/index4.html) */
  height: 0;
  padding-top: 75%;
  position: relative;
}

svg {
  /* IE fix (Sara Soueidan: https://tympanus.net/Tutorials/ResponsiveSVGs/index4.html) */
  position: absolute;
  top: 0;
  left: 0;
}

.flex-container {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-around;
  margin: auto;
}

.btn {
  position: relative;
  padding: 1em;
  margin: 2em auto;
  outline: 0;
  text-transform: uppercase;
  text-align: center;
  vertical-align: middle;
  letter-spacing: 1px;
  color: #fff;
  background-color: #a465f2;
  border-color: #842def;
  border-radius: 10px;
  cursor: pointer;
  transition: border-color, 0.5s,
              background-color 0.5s;
}

.btn:focus,
.btn:hover {
  border-color: #2d055e;
  background-color: #5108aa;
}

.btn:disabled,
.btn[disabled]{
  border: 1px solid #999999;
  background-color: #cccccc;
  color: #666666;
  cursor:not-allowed;
}
              
            
!

JS

              
                //Eyes blinking
const moveEye = (elem, width, height, delay = 1000) => {
  Velocity(elem, {
    rx: width,
    ry: height
  }, {
    duration: 0.1,
    delay: delay,
    easing: 'linear'
  });
};

//Fish movement
const moveFish = (elem, moveBy, initialPos, btn, bool = false) => {
  Velocity(elem, {
    translateX: [moveBy, initialPos]
  }, {
    duration: 5000,
    easing: 'linear',
    complete: () => {
      if (bool) {
        btn.disabled = false;
      }
    }
  });
};

//Fish turning around
const rotateFish = (elem, moveBy) => {
  Velocity(elem, {
    rotateY: moveBy,
    transformOriginX: '50%',
    transformOriginY: '50%'
  }, {
    duration: 500,
    easing: [.26, 1, .49, 0]
  });
};

//Caching elements for animation
const bubbles = document.querySelectorAll('.bubble'),
  fish = document.querySelector('.fish'),
  eyePupil = document.querySelector('.eye-pupil'),
  eye = document.querySelector('.front-eye'),
  btnPlay = document.querySelector('.btn-play');

//Bubbles animation
Velocity(bubbles, {
  cx: '+=30',
  cy: '+=30',
  rx: 3,
  ry: 2,
  opacity: 0
}, {
  loop: true,
  easing: 'linear',
  duration: 2000
});

//Using requestAnimationFrame() for the looping blinking eye animation
let eyeMoveTimer;

const eyeMove = (timestamp) => {
  //close eye
  moveEye(eyePupil, 0, 0, 5000);
  moveEye(eye, 30, 2, 5000);
  //open eye
  moveEye(eyePupil, 15, 15);
  moveEye(eye, 50, 50);

  eyeMoveTimer = requestAnimationFrame(eyeMove);
};

//Set the blinking in motion
eyeMove();

/*fish movement animation */
const play = () => {
  moveFish(fish, '-1000', 0, btnPlay);
  rotateFish(fish, '180deg');
  moveFish(fish, 0, '-1000', btnPlay, true);
  rotateFish(fish, '0deg');
};

btnPlay.addEventListener('click', function() {
  this.disabled = true;
  play();
});
              
            
!
999px

Console