CSS 动画

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html

<div class="main-content">
  <h1>Favorite time of the day?</h1>
  <div class="window">
    <div class="cat">
      <svg width="80px" viewBox="0 0 15.59 15.59">
        <path d="M14.42,11.993c-0.104-1.334-0.709-2.336-1.57-3.153c-0.479-0.449-0.906-0.563-1.414-0.563c0,0-0.204,0.005-0.041,0.212  c0.215,0.271,1.791,2.328,1.768,4.011c-0.029,1.948-1.958,1.837-1.958,1.837c0.812-1.542,0.402-3.001,0.276-3.512  c-0.238-0.943-0.709-1.857-1.417-2.738C9.191,6.988,8.312,6.468,7.425,6.523c-0.379-0.654-0.716-1.18-1.011-1.61  C8.02,3.479,6.974,2.787,6.063,0c-0.211,0.591-0.38,1.028-0.507,1.31c-0.644-0.08-2.071-0.08-2.714,0  C2.716,1.028,2.547,0.591,2.336,0C1.423,2.794,0.374,3.467,1.999,4.909c0.173,3.278,0.849,4.149,1.942,5.732  c0.9,1.304,0.675,1.768,1.098,3.569c-3.197,2.014,2.223,1.241,3.063,1.2C10.266,15.305,14.777,16.6,14.42,11.993z"></path>
      </svg>
    </div>
    <div class="illustration">
      <div class="time dusk">
        <div class="sky">
          <svg width="250px" viewBox="0 0 113.39 99.21">
            <linearGradient id="sky_sunset" gradientUnits="userSpaceOnUse" x1="0%" y1="0%" x2="100%" y2="0%" gradientTransform="rotate(-25)">
              <stop offset="0%" stop-color="#f7ffa9" stop-opacity="1"></stop>
              <stop offset="40%" stop-color="#ffcc33" stop-opacity="1"></stop>
              <stop offset="100%" stop-color="#ffbe1d" stop-opacity="1"></stop>
            </linearGradient>
            <linearGradient id="sky_dusk" gradientUnits="userSpaceOnUse" x1="0%" y1="0%" x2="100%" y2="0%" gradientTransform="rotate(45)">
              <stop offset="0%" stop-color="#ffd4fe" stop-opacity="1"></stop>
              <stop offset="30%" stop-color="#ffd4fe" stop-opacity="1"></stop>
              <stop offset="100%" stop-color="#ffd26a" stop-opacity="1"></stop>
            </linearGradient>
            <polygon fill="#B3EFFF" id="sky" points="111.971,97.368 111.971,1.842 1.419,1.842 1.419,9.042 1.419,97.368"></polygon>
          </svg>
        </div>
        <div class="sun">
          <svg width="90px" viewBox="0 0 90.71 90.71">
            <g>
              <circle opacity="0.1" fill="#FFECDC" cx="45.355" cy="45.354" r="43.212"></circle>
              <circle opacity="0.3" fill="#FFEBDE" cx="45.355" cy="45.354" r="31.131"></circle>
              <circle id="sun" fill="#f9db5a" cx="45.355" cy="45.354" r="21.374"></circle>
            </g>
          </svg>
        </div>
        <div class="clouds">
          <svg width="80px" viewBox="0 0 42.52 19.84">
            <g>
              <path fill="#fff" d="M38.582,8.005c1.865,0,3.393,1.673,3.393,3.717l0,0c0,2.042-1.527,3.716-3.393,3.716H24.039h-0.484   c-2.676,0-4.847-2.378-4.847-5.309c0-2.932,2.17-5.309,4.847-5.309c0,0,2.242-4.247,7.756-4.247c3.453,0,6.787,1.925,6.787,7.432   H38.582z"></path>
              <path fill="#FCFCFC" d="M20.863,11.667c1.908,0,3.471,1.71,3.471,3.8l0,0c0,2.09-1.563,3.8-3.471,3.8H5.998H5.501   c-2.736,0-4.956-2.431-4.956-5.428s2.219-5.428,4.956-5.428c0,0,2.292-4.342,7.929-4.342c3.532,0,6.939,1.968,6.939,7.598H20.863z"></path>
            </g>
          </svg>
        </div>
        <div class="stars">
          <svg width="210px" viewBox="0 0 99.21 25.51">
            <g>
              <ellipse opacity="0.3" fill="#FFFFFF" cx="97.067" cy="11.361" rx="0.727" ry="0.832"></ellipse>
              <ellipse opacity="0.3" fill="#FFFFFF" cx="2.144" cy="3.901" rx="0.728" ry="0.831"></ellipse>
              <ellipse opacity="0.3" fill="#FFFFFF" cx="14.743" cy="10.455" rx="0.727" ry="0.831"></ellipse>
              <ellipse opacity="0.3" fill="#FFFFFF" cx="66.439" cy="9.407" rx="0.728" ry="0.831"></ellipse>
              <ellipse opacity="0.3" fill="#FFFFFF" cx="77.518" cy="1.332" rx="0.728" ry="0.831"></ellipse>
              <ellipse opacity="0.3" fill="#FFFFFF" cx="82.514" cy="13.459" rx="0.728" ry="0.831"></ellipse>
            </g>
          </svg>
        </div>
        <div class="moon">
          <svg width="35px" viewBox="0 0 15.59 19.28">
            <path opacity="0.8" fill="#FFFFFF" d="M13.718,16.993c-5.085,0-9.208-4.122-9.208-9.208c0-2.97,1.407-5.608,3.589-7.292  C3.722,1.205,0.381,5,0.381,9.579c0,5.086,4.123,9.208,9.209,9.208c2.116,0,4.063-0.716,5.619-1.916  C14.722,16.95,14.226,16.993,13.718,16.993z"></path>
          </svg>
        </div>
        <div class="mountain">
          <svg width="250px" viewBox="0 0 113.39 36.85">
            <path id="mountain" fill="#87D6D6" d="M111.971,0.478C106.576,2.7,95.837,16.269,88.655,15C81.29,13.699,68.052,6.244,62.31,3.639  C56.566,1.036,41.955,16.42,36.835,15.948c-5.118-0.474-17.355-9.232-23.475-8.403c-3.964,0.537-8.932,4.276-11.941,6.844v21.983  h110.552V0.478z"></path>
          </svg>
        </div>
        <div class="hill">
          <svg width="250px" viewBox="0 0 113.39 17.86">
            <path id="hill" fill="#38C6B1" d="M111.971,12.132c-4.609-0.766-8.889-1.889-12.432-3.579C86.127-0.36,71.48-3.606,43.082,6.31  c-6.086,0.811-7.853,0.51-17.234-2.951C18.487,0.644,8.764,1.176,1.419,2.621v15.017h110.551V12.132z"></path>
          </svg>
        </div>
        <div class="land">
          <svg width="250px" viewBox="0 0 113.39 24.09">
            <path id="land" fill="#4CB5AB" d="M111.971,23.82V3.328C84.865-6.96,12.407,11.765,1.419,14.708v9.112H111.971z"></path>
          </svg>
        </div>
        <div class="trees">
          <svg width="210px" viewBox="0 0 85.04 41.1">
            <g>
              <rect class="trunks" x="75.121" y="26.724" fill="#8C5F50" width="2.166" height="8.666"></rect>
              <rect class="trunks" x="67.539" y="28.89" fill="#8C5F50" width="2.168" height="6.5"></rect>
            </g>
            <g>
              <path class="trees" fill="#A0D755" d="M83.785,21.309c0,4.187-3.393,7.581-7.58,7.581s-7.582-3.395-7.582-7.581     c0-9.749,3.395-20.579,7.582-20.579S83.785,11.56,83.785,21.309z"></path>
              <path class="trees" fill="#A0D755" d="M75.121,24.933c0,3.382-2.91,6.125-6.5,6.125c-3.588,0-6.498-2.743-6.498-6.125     c0-7.873,2.91-16.622,6.498-16.622C72.211,8.311,75.121,17.06,75.121,24.933z"></path>
            </g>
            <g opacity="0.2">
              <path fill="#FFFFFF" d="M72.955,21.309c0-8.892,1.883-18.68,4.332-20.333c-0.354-0.16-0.715-0.247-1.082-0.247     c-4.188,0-7.582,10.83-7.582,20.579c0,4.187,3.395,7.581,7.582,7.581c0.369,0,0.729-0.035,1.082-0.086     C74.84,28.277,72.955,25.127,72.955,21.309z"></path>
              <path fill="#FFFFFF" d="M66.457,24.933c0-7.106,1.383-14.901,3.191-16.359c-0.334-0.157-0.676-0.263-1.025-0.263     c-3.588,0-6.5,8.749-6.5,16.622c0,3.382,2.912,6.125,6.5,6.125c0.35,0,0.691-0.034,1.025-0.084     C67.84,30.508,66.457,27.984,66.457,24.933z"></path>
            </g>
            <g>
              <rect class="trunks" x="3.466" y="35.946" fill="#8C5F50" width="1.475" height="4.424"></rect>
              <path class="trees" fill="#A0D755" d="M7.153,34.472c0,1.628-1.32,2.949-2.949,2.949S1.254,36.1,1.254,34.472c0-5.162,1.32-11.799,2.949-11.799     S7.153,29.31,7.153,34.472z"></path>
              <path opacity="0.2" fill="#FCFCFC" d="M3.466,34.472c0-4.233,0.666-9.452,1.58-11.194c-0.267-0.383-0.55-0.604-0.842-0.604    c-1.629,0-2.949,6.637-2.949,11.799c0,1.628,1.32,2.949,2.949,2.949c0.295,0,0.573-0.057,0.842-0.137    C4.135,36.919,3.466,35.806,3.466,34.472z">       </path>
            </g>
          </svg>
        </div>
      </div>
    </div>
  </div>
  <div class="option-wrapper">
    <div class="option active" data-option="dusk">Dusk</div>
    <div class="option" data-option="day">Day</div>
    <div class="option" data-option="sunset">Sunset</div>
    <div class="option" data-option="night">Night</div>
  </div>
</div>

css

body {
  background: radial-gradient(#870000, #53346d);
  font-family: "Comfortaa", sans-serif;
}

.main-content {
  max-width: 700px;
  margin: 4em auto 0;
  text-align: center;
}

h1 {
  margin: 2em 0;
  color: #fff;
}

svg {
  display: inline-block;
}

path, polygon, circle, rect {
  transition: fill 1s ease;
}

.window {
  position: relative;
  background: #fff;
  margin: 0 auto 2em;
  display: inline-block;
  padding: 10px;
}
.window:before {
  content: '';
  position: absolute;
  margin: auto;
  left: 0;
  right: 0;
  height: 18px;
  top: 100%;
  width: 112%;
  margin-left: -6%;
  background: #f4c7c7;
}

.cat {
  position: absolute;
  z-index: 10;
  bottom: -5px;
  right: -35px;
}

.illustration {
  position: relative;
  align-self: end;
  margin: auto;
  width: 250px;
  overflow: hidden;
}

.mountain, .hill, .land, .trees, .sun, .clouds, .moon, .stars {
  position: absolute;
  left: 0;
  margin: auto;
  right: 0;
}

.mountain {
  bottom: 45px;
}

.hill {
  bottom: 45px;
}

.trees {
  bottom: 25px;
}

.sun {
  top: 120px;
  margin-left: -20px;
  transition: all 1s ease;
  transform: scale(0.2);
}

.moon, .stars {
  top: 25px;
  opacity: 0;
}

.land {
  bottom: 3px;
}

.clouds {
  top: 50px;
  right: -500px;
  transition: all 1s ease .1s;
}

.day .sun {
  top: 10px;
  margin-left: 0;
  transform: scale(1);
}
.day .clouds {
  right: 0;
}

.night .stars, .night .moon {
  opacity: 1;
  transition: all 1s ease .5s;
}
.night #sky {
  fill: #17377f;
}
.night #mountain {
  fill: #73addf;
}
.night #hill {
  fill: #659fcd;
}
.night #land {
  fill: #508bb5;
}
.night .trees {
  fill: #1c2c3b;
}
.night .trunks {
  fill: #3f3e3d;
}

.sunset .sun {
  top: 60px;
  margin-left: -80px;
  transform: scale(1);
}
.sunset #sun {
  fill: #fff;
}
.sunset #sky {
  fill: url(#sky_sunset);
}
.sunset #mountain {
  fill: #efbb2b;
}
.sunset #hill {
  fill: #e6ad28;
}
.sunset #land {
  fill: #de9f26;
}
.sunset .trees {
  fill: #747c0b;
}
.sunset .trunks {
  fill: #3f3e3d;
}

.dusk .sun {
  top: 60px;
  margin-left: 140px;
  transform: scale(1);
}
.dusk #sun {
  fill: #ffffda;
}
.dusk #sky {
  fill: url(#sky_dusk);
}
.dusk #mountain {
  fill: #f1a3a2;
}
.dusk #hill {
  fill: #e09c9c;
}
.dusk #land {
  fill: #c4918d;
}
.dusk .trees {
  fill: #ce791c;
}
.dusk .trunks {
  fill: #8c5f50;
}

.option-wrapper {
  display: flex;
  margin: 3em auto;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  padding: 5px;
  max-width: 300px;
  font-size: 12px;
  line-height: 1.2;
}
.option-wrapper .option {
  transition: all 200ms ease;
  padding: 10px 10px 8px;
  width: 50%;
  border-radius: 4px;
  cursor: pointer;
  color: #fff;
}
.option-wrapper .option.active {
  background: #fff;
  color: #333;
  pointer-events: none;
}

aside.context {
  text-align: center;
  color: #fff;
}
aside.context a {
  text-decoration: none;
  color: #fff;
  padding: 3px 0;
  border-bottom: 1px dashed;
}
aside.context .explanation {
  max-width: 700px;
  margin: 4em auto;
}

footer {
  text-align: center;
  margin: 8em auto;
  width: 100%;
}
footer a {
  text-decoration: none;
  display: inline-block;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: transparent;
  border: 1px dashed #fff;
  color: #fff;
  margin: 5px;
}
footer a:hover {
  background: rgba(255, 255, 255, 0.1);
}
footer a .icons {
  margin-top: 12px;
  display: inline-block;
  font-size: 20px;
}

JavaScript

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