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CSS

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HTML 

              
                <div class="ctn">
  <canvas id="c" width="360px" height="640px"></canvas>
  <div id="scoreboard">0</div>
  <div id="start-screen">
    <div id="ctrl-ctn">
      <div id="up" class="ctrl-btn">↑</div>
      <div id="space" class="ctrl-btn">SPACE</div>
      <div id="tap" class="ctrl-btn">TAP</div>
    </div>
  </div>
  <div id="gameover-screen">
    <div id="gameover">GAME OVER</div>
    <div id="replay">REPLAY</div>
  </div>
</div>
!

CSS 

              
                body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: Helvetica, sans-serif;
  overflow-x: hidden;
}

canvas {
  position: absolute;
}

.ctn {
  position: relative;
  width: 360px;
  height: 640px;
}

#scoreboard {
  position: absolute;
  top: 540px;
  width: 360px;
  text-align: center;
  font-size: 50px;
  color: #333333;
}

#start-screen {
  position: absolute;
  top: 20px;
}

#gameover-screen {
  visibility: hidden;
  position: absolute;
  width: 360px;
  height: 640px;
  opacity: 0;
  transition: opacity 1s;
  text-align: center;
}

#gameover {
  width: 280px;
  background-color: #333333;
  color: #ffffff;
  padding: 10px 20px;
  font-size: 40px;
  letter-spacing: 4px;
  margin: auto;
  margin-top: 200px;
}

#replay {
  width: 100px;
  background-color: #333333;
  color: #ffffff;
  padding: 10px 20px;
  font-size: 20px;
  letter-spacing: 4px;
  transition: background-color 1s;
  margin: 100px auto;
}

#replay:hover {
  background-color: #ffffff;
  color: #333333;
  cursor: pointer;
}

#ctrl-ctn {
  position: absolute;
  top: 300px;
  left: 80px;
  opacity: 1;
  transition: opacity 1s;
}

.ctrl-btn {
  background-color: #333333;
  color: #ffffff;
  text-align: center;
  font-size: 18px;
  padding: 8px 16px;
  margin: 10px;
}
!

JS 

              
                var bgSVG = `
            <svg id="bg-svg" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg"
                height="640" viewBox="0 0 360 640.00001" width="360" version="1.1" xmlns:cc="http://creativecommons.org/ns#"
                xmlns:dc="http://purl.org/dc/elements/1.1/">
                <rect id="rect5189-8" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                    height="640" width="360" y="0" x="0" fill="#d7eef4" />
                <g fill="#333333">
                    <path id="path10590-3-7-0" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                        d="m153.94 443.28c-1.6123 0-2.9194 1.2047-2.9194 2.6916v10.868c0 5.5017-2.7017 5.5166-4.9971 5.5166v-11.866c0-2.5165-1.8644-4.5558-4.1642-4.5558-2.2999 0-4.1643 2.0393-4.1643 4.5558v20.342c-2.2954 0-4.9971-0.015-4.9971-5.5165v-9.4802c0-1.4869-1.3071-2.6916-2.9193-2.6916-1.6123 0-2.9193 1.2047-2.9193 2.6916v12.354c0 5.6939 4.6336 9.0964 10.836 9.0964v15.213h8.3285v-23.689c6.2021 0 10.836-3.4012 10.836-9.0952v-13.743c0-1.4869-1.3071-2.6916-2.9193-2.6916z" />
                    <path id="path10590-3-5-8-4" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                        d="m225.91 447.5c2.2227 0 4.0245 1.9708 4.0245 4.4028v14.293c2.2182 0 4.8292-0.0145 4.8292-5.3313v-5.9423c0-1.4369 1.2632-2.6012 2.8213-2.6012s2.8213 1.1642 2.8213 2.6012v8.7195c0 5.5027-4.4781 8.7908-10.472 8.7908v20.068h-8.0489v-40.597c0-2.432 1.8018-4.4028 4.0244-4.4028z" />
                    <path id="path10590-3-4-6-4" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                        d="m46.842 445.94c-2.2999 0-4.1643 2.0403-4.1643 4.5568v20.342c-2.2954 0-4.9971-0.0161-4.9971-5.5176v-7.2581c0-1.4869-1.307-2.6927-2.9193-2.6927s-2.9193 1.2058-2.9193 2.6927v10.133c0 5.6939 4.6337 9.0952 10.836 9.0952v15.214h8.3285v-17.648c6.2021 0 10.836-3.4013 10.836-9.0952v-5.9699c0-1.4869-1.307-2.6916-2.9193-2.6916s-2.9193 1.2047-2.9193 2.6916v3.095c0 5.5016-2.7017 5.5165-4.9971 5.5165v-17.906c0-2.5165-1.8644-4.5568-4.1642-4.5568z" />
                    <path id="path10590-3-4-6-4-6" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                        d="m320.43 445.94c-2.2998 0-4.1642 2.0403-4.1642 4.5568v20.342c-2.2954 0-4.9972-0.0161-4.9972-5.5176v-7.2581c0-1.4869-1.307-2.6927-2.9193-2.6927-1.6122 0-2.9193 1.2058-2.9193 2.6927v10.133c0 5.6939 4.6337 9.0952 10.836 9.0952v15.214h8.3285v-17.648c6.2021 0 10.836-3.4013 10.836-9.0952v-5.9699c0-1.4869-1.307-2.6916-2.9193-2.6916s-2.9193 1.2047-2.9193 2.6916v3.095c0 5.5016-2.7018 5.5165-4.9971 5.5165v-17.906c0-2.5165-1.8644-4.5568-4.1643-4.5568z" />
                </g>
            </svg>
        `;

var fgSVG = `
            <svg id="fg-svg" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg"
                height="150" viewBox="0 0 360 150" width="360" version="1.1" xmlns:cc="http://creativecommons.org/ns#"
                xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dc="http://purl.org/dc/elements/1.1/">
                <rect style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                    height="147.5" width="360" y="2.5" x="0" fill="#ffb380" />
                <path stroke="#333333" stroke-width="5" fill="none" d="m-0.000001625 2.5h360" />
                <circle id="a" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                    cx="-9.75" cy="11" r="2.5" fill="#333333" />
                <use xlink:href="#a" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="matrix(.9 0 0 .9 9.025 8.6)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="matrix(.8 0 0 .8 18.05 17.2)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="translate(15 -3.7151e-8)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="matrix(.9 0 0 .9 24.025 8.6)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="matrix(.8 0 0 .8 33.05 17.2)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="translate(30 -3.7151e-8)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="matrix(.9 0 0 .9 39.025 8.6)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="matrix(.8 0 0 .8 48.05 17.2)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="translate(45 -3.7151e-8)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="matrix(.9 0 0 .9 54.025 8.6)" height="100%" width="100%" y="0" x="0" />
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                <use xlink:href="#a" transform="translate(60 -3.7151e-8)" height="100%" width="100%" y="0" x="0" />
                <use xlink:href="#a" transform="matrix(.9 0 0 .9 69.025 8.6)" height="100%" width="100%" y="0" x="0" />
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                <use xlink:href="#a" transform="matrix(.9 0 0 .9 219.03 8.6)" height="100%" width="100%" y="0" x="0" />
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                <use xlink:href="#a" transform="matrix(.9 0 0 .9 249.03 8.6)" height="100%" width="100%" y="0" x="0" />
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                <use xlink:href="#a" transform="matrix(.8 0 0 .8 378.05 17.2)" height="100%" width="100%" y="0" x="0" />
            </svg>
        `;

var boneOpen = `
            <svg id="bone" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg"
                height="400" viewBox="0 0 79.999993 400.00001" width="80" version="1.1" xmlns:cc="http://creativecommons.org/ns#"
                xmlns:dc="http://purl.org/dc/elements/1.1/">
        `;
var boneMid = `
            <path id="path4855-9" stroke-linejoin="round" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                d="m12.343 397.5-0.274-343.44c-0.066-8.49-9.569-14.59-9.569-27.05 0-12.457 7.957-24.615 21.609-24.551 7.448 0.0614 12.539 3.9094 15.891 8.055 3.352-4.1456 8.443-7.9937 15.891-8.055 13.652-0.0637 21.609 12.094 21.609 24.551s-9.5033 18.557-9.5692 27.044l-0.27382 343.41z"
                stroke="#333333" stroke-linecap="round" stroke-width="5" fill="#e9ddaf" />
            <g stroke-linejoin="round" stroke="#333333" stroke-linecap="round" stroke-width="5" fill="none">
                <path id="path4855-2-0" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                    d="m13.781 26.92a11.746 12.772 0 0 1 11.746 -12.78" />
                <path id="path5025" d="m56.472 115.85v78.183" />
                <path id="path5025-3-6" d="m56.472 92.06v10.609" />
                <path id="path5025-0" d="m56.472 253.62v126.19" />
                <path id="path5025-3-6-6" d="m56.472 212.25v24.515" />
            </g>
        `;
var boneClose = "</svg>";

var botBoneSVG = boneOpen + boneMid + boneClose;
var topBoneSVG =
  boneOpen +
  '<g transform="rotate(180) translate(-80, -400)">' +
  boneMid +
  "</g>" +
  boneClose;

var sprite1 = `
            <svg id="sprite-1" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg"
                height="59.968" viewBox="0 0 100.02518 59.967859" width="100.03" version="1.1" xmlns:cc="http://creativecommons.org/ns#"
                xmlns:dc="http://purl.org/dc/elements/1.1/">
                <g stroke-linecap="round">
                    <ellipse id="body" stroke-linejoin="round" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                        rx="27.792" transform="matrix(.97502 -.22210 .30061 .95375 0 0)" stroke="#333333" ry="14.864" cy="46.239"
                        cx="16.016" stroke-width="4.0066" fill="#d38d5f" />
                    <g id="head" transform="matrix(.5 0 0 .5 .011191 -.016144)">
                        <path id="path6767-3" stroke-linejoin="round" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                            d="m196.03 86.922s-61.739-3.1063-75.355-6.8143c-14.08-3.835-25.527-11.615-25.527-25.941 0-13.335-15.956-50.135-15.956-50.135s30.525 17.767 41.481 24.195c11.784 6.9142 75.355 44.369 75.355 58.695z"
                            stroke="#333333" stroke-width="8" fill="#d38d5f" />
                        <ellipse id="eye" stroke-linejoin="round" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                            rx="5.8902" ry="5.9862" stroke="#ffffff" cy="45.876" cx="120.32" stroke-width="5" fill="#333333" />
                        <path id="mouth" d="m194.28 84.826c-23.83-4.875-43.57-11.271-63.81-23.461" fill-rule="evenodd"
                            stroke="#333333" stroke-width="5" fill="#d38d5f" />
                    </g>
                    <path id="wing-top" stroke-linejoin="round" d="m10.252 43.445c0.8135-13.421 3.458-26.194-5.2065-41.445 22.742 0 34.917 19.591 38.055 31.493l0.0005-0.001"
                        fill-rule="evenodd" stroke="#333333" stroke-width="4" fill="#d38d5f">
                    </path>
                </g>
            </svg>
        `;

var sprite2 = `
            <svg id="sprite-2" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg"
                height="59.968" viewBox="0 0 100.02518 59.967859" width="100.03" version="1.1" xmlns:cc="http://creativecommons.org/ns#"
                xmlns:dc="http://purl.org/dc/elements/1.1/">
                <g stroke-linecap="round">
                    <ellipse id="body" stroke-linejoin="round" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                        rx="27.792" ry="14.864" stroke="#333333" transform="matrix(.97502 -.22210 .30061 .95375 0 0)" cy="46.239"
                        cx="16.016" stroke-width="4.0066" fill="#d38d5f" />
                    <g id="head" transform="matrix(.5 0 0 .5 .011191 -.016144)">
                        <path id="path6767-3" stroke-linejoin="round" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                            d="m196.03 86.922s-61.739-3.1063-75.355-6.8143c-14.08-3.835-25.527-11.615-25.527-25.941 0-13.335-15.956-50.135-15.956-50.135s30.525 17.767 41.481 24.195c11.784 6.9142 75.355 44.369 75.355 58.695z"
                            stroke="#333333" stroke-width="8" fill="#d38d5f" />
                        <ellipse id="eye" stroke-linejoin="round" style="color-rendering:auto;color:#000000;isolation:auto;mix-blend-mode:normal;shape-rendering:auto;solid-color:#000000;image-rendering:auto"
                            rx="5.8902" ry="5.9862" stroke="#ffffff" cy="45.876" cx="120.32" stroke-width="5" fill="#333333" />
                        <path id="mouth" d="m194.28 84.826c-23.83-4.875-43.57-11.271-63.81-23.461" fill-rule="evenodd"
                            stroke="#333333" stroke-width="5" fill="#d38d5f" />
                    </g>
                    <path id="wing-bot" stroke-linejoin="round" d="m10.252 43.445c8.7795 5.151 8.41 14.523 8.41 14.523 15.09 0 27.976-12.688 24.439-24.475l0.0005-0.0005"
                        fill-rule="evenodd" stroke="#333333" stroke-width="4" fill="#d38d5f">
                    </path>
                </g>
            </svg>
        `;

var bg = new Image();
bg.src = "data:image/svg+xml," + encodeURIComponent(bgSVG);

var fg = new Image();
fg.src = "data:image/svg+xml," + encodeURIComponent(fgSVG);

var dinoGlide = new Image();
dinoGlide.src = "data:image/svg+xml," + encodeURIComponent(sprite1);

var dinoFlap = new Image();
dinoFlap.src = "data:image/svg+xml," + encodeURIComponent(sprite2);

var topBone = new Image();
topBone.src = "data:image/svg+xml," + encodeURIComponent(topBoneSVG);

var botBone = new Image();
botBone.src = "data:image/svg+xml," + encodeURIComponent(botBoneSVG);

var canvas = document.getElementById("c");
var ctx = canvas.getContext("2d");

var hitboxWidth = 60;
var hitboxHeight = 15;

var spriteOffset_X = -10;
var spriteOffset_Y = -25;

var fgPos_X = 0;

var dinoPos_X = 100;
var dinoPos_Y = 250;
var dinoAngle = 0;
var dinoState = dinoGlide;

var minBoneHeight = -330;
var maxBoneHeight = -160;

var scrollSpeed = -3;
var gravity = 0.3;
var lift = -8;
var velocity = 0;

var start = false;
var gameOver = false;
var score = 0;

var bonePtr = 0;
var boneStart = 400;
var flyGap = 180;
var boneGap = 280;
var bones = [
  { x: boneStart, y: getRandomHeight(minBoneHeight, maxBoneHeight) },
  { x: boneStart + boneGap, y: getRandomHeight(minBoneHeight, maxBoneHeight) },
  {
    x: boneStart + 2 * boneGap,
    y: getRandomHeight(minBoneHeight, maxBoneHeight)
  }
];

function getRandomHeight(min, max) {
  return Math.floor(Math.random() * (max - min) + min);
}

function playerInput() {
  if (!start) {
    start = true;
    velocity = lift;
    dinoAngle = -20;
    document.getElementById("ctrl-ctn").style.opacity = 0;
  } else {
    if (!gameOver) {
      velocity = lift;
      dinoAngle = -20;
    }
  }
}

function checkCollision() {
  // set upper bound
  if (dinoPos_Y <= -hitboxHeight) {
    velocity = 0;
  }

  // dino hit the ground
  if (dinoPos_Y + hitboxHeight >= canvas.height - fg.height) {
    velocity = 0;
    dinoPos_Y = canvas.height - fg.height - hitboxHeight;
    setGameOver();
  }

  // dino hit bone
  if (
    dinoPos_X + hitboxWidth >= bones[bonePtr].x &&
    dinoPos_X < bones[bonePtr].x + topBone.width &&
    (dinoPos_Y <= bones[bonePtr].y + topBone.height ||
      dinoPos_Y + hitboxHeight >= bones[bonePtr].y + topBone.height + flyGap)
  ) {
    setGameOver();
  }
}

function replay() {
  start = false;
  gameOver = false;

  score = 0;
  velocity = 0;

  dinoPos_X = 100;
  dinoPos_Y = 250;
  dinoAngle = 0;
  dinoState = dinoGlide;

  bonePtr = 0;
  bones = [
    { x: boneStart, y: getRandomHeight(minBoneHeight, maxBoneHeight) },
    {
      x: boneStart + boneGap,
      y: getRandomHeight(minBoneHeight, maxBoneHeight)
    },
    {
      x: boneStart + 2 * boneGap,
      y: getRandomHeight(minBoneHeight, maxBoneHeight)
    }
  ];

  document.getElementById("ctrl-ctn").style.opacity = 1;

  document.getElementById("gameover-screen").style.visibility = "hidden";
  document.getElementById("gameover-screen").style.opacity = 0;
}

function setGameOver() {
  gameOver = true;
  document.getElementById("gameover-screen").style.visibility = "visible";
  document.getElementById("gameover-screen").style.opacity = 1;
}

function update() {
  // foreground scroll
  if (!gameOver) {
    fgPos_X += scrollSpeed;

    if (fgPos_X <= -canvas.width) {
      fgPos_X = 0;
    }
  }

  // game started
  if (start) {
    velocity += gravity;
    dinoPos_Y += velocity;

    // if velocity is negative show dino flap sprite else show dino falling
    if (velocity < 0) {
      dinoState = dinoFlap;
    } else {
      dinoState = dinoGlide;
      dinoAngle = Math.min(dinoAngle + 2, 90);
    }

    checkCollision();

    if (!gameOver) {
      for (var i = 0; i < bones.length; i++) {
        // scroll bones across screen
        bones[i].x += scrollSpeed;

        // reassign bone object XY after it leaves screen
        if (bones[i].x <= -topBone.width) {
          if (i == 0) {
            bones[0].x = bones[bones.length - 1].x + boneGap;
          } else {
            bones[i].x = bones[i - 1].x + boneGap;
          }

          bones[i].y = getRandomHeight(minBoneHeight, maxBoneHeight);
        }
      }

      // if dino passed through the bone increase score
      if (dinoPos_X >= bones[bonePtr].x + topBone.width) {
        score++;

        if (bonePtr == 2) {
          bonePtr = 0;
        } else {
          bonePtr++;
        }
      }
    }
  }
  render();
}

function render() {
  document.getElementById("scoreboard").innerHTML = score;

  ctx.drawImage(bg, 0, 0);

  for (var i = 0; i < bones.length; i++) {
    ctx.drawImage(topBone, bones[i].x, bones[i].y);
    ctx.drawImage(botBone, bones[i].x, bones[i].y + topBone.height + flyGap);
  }

  ctx.save();
  ctx.translate(
    dinoPos_X + hitboxWidth / 2 + spriteOffset_X,
    dinoPos_Y + hitboxHeight / 2
  );
  ctx.rotate(dinoAngle * Math.PI / 180);
  ctx.drawImage(
    dinoState,
    -hitboxWidth / 2,
    -hitboxHeight / 2 + spriteOffset_Y
  );
  ctx.restore();

  // Show hitbox
  // ctx.fillStyle = "#ff00ff";
  // ctx.fillRect(dinoPos_X, dinoPos_Y, hitboxWidth, hitboxHeight);

  ctx.drawImage(fg, fgPos_X, canvas.height - fg.height);
  ctx.drawImage(fg, fgPos_X + fg.width, canvas.height - fg.height);

  window.requestAnimationFrame(update);
}

document.addEventListener("keydown", function(e) {
  var char = e.which || e.keyCode;
  if (char == 32 || char == 38) {
    e.preventDefault();
    playerInput();
  }
});

document.addEventListener("touchstart", function() {
  playerInput();
});

document.getElementById("replay").addEventListener("click", function() {
  replay();
});

update();
!
999px

Console