https://codepen.io/jcoulterdesign/pen/OMmZPd

HTML :

<div class='left'>
  <div class='left_inner'>
    <h1>Funky Pure CSS Accordion</h1>
    <h2>Go on, give it some clicks</h2>
    <a class='download' href='https://codepen.io/jcoulterdesign/pens/popular/' target='_blank'>
      <i class="icon ion-eye"></i> <span>View my other pens</span>
    </a>
    <a class='follow' href='https://codepen.io/jcoulterdesign/' target='_blank'>
      <i class="icon ion-social-codepen-outline"></i> <span>Follow me on codepen</span>
    </a>
  </div>
</div>
<div class='right'>
  <div class='app'>
    <div class='app_inner'>
      <input checked='' id='tab-1' name='buttons' type='radio'>
      <label for='tab-1'>
        <div class='app_inner__tab'>
          <h2>
            <i class='icon ion-android-alarm-clock'></i>
            8am - 10am
          </h2>
          <div class='tab_left'>
            <i class='big icon ion-android-color-palette'></i>
            <div class='tab_left__image'>
              <i class='icon ion-android-color-palette'></i>
            </div>
          </div>
          <div class='tab_right'>
            <h3>Jamie talks design</h3>
            <h4>Monday - Thursday</h4>
            <p>I talk a bunch of rubbish</p>
            <button>More information</button>
          </div>
        </div>
      </label>
      <input false='' id='tab-2' name='buttons' type='radio'>
      <label for='tab-2'>
        <div class='app_inner__tab'>
          <h2>
            <i class='icon ion-android-alarm-clock'></i>
            10am - 12am
          </h2>
          <div class='tab_left'>
            <i class='big icon ion-music-note'></i>
            <div class='tab_left__image'>
              <i class='icon ion-music-note'></i>
            </div>
          </div>
          <div class='tab_right'>
            <h3>Arctic Monkeys Live</h3>
            <h4>Monday - Wednesday</h4>
            <p>Music for your lug holes</p>
            <button>More information</button>
          </div>
        </div>
      </label>
      <input false='' id='tab-3' name='buttons' type='radio'>
      <label for='tab-3'>
        <div class='app_inner__tab'>
          <h2>
            <i class='icon ion-android-alarm-clock'></i>
            12am - 4pm
          </h2>
          <div class='tab_left'>
            <i class='big icon ion-android-microphone'></i>
            <div class='tab_left__image'>
              <i class='icon ion-android-microphone'></i>
            </div>
          </div>
          <div class='tab_right'>
            <h3>Steven Fry podcast</h3>
            <h4>Staurday - Sunday</h4>
            <p>Steven Fry says words</p>
            <button>More information</button>
          </div>
        </div>
      </label>
      <input false='' id='tab-4' name='buttons' type='radio'>
      <label for='tab-4'>
        <div class='app_inner__tab'>
          <h2>
            <i class='icon ion-android-alarm-clock'></i>
            4pm - 8pm
          </h2>
          <div class='tab_left'>
            <i class='big icon ion-android-bar'></i>
            <div class='tab_left__image'>
              <i class='icon ion-android-bar'></i>
            </div>
          </div>
          <div class='tab_right'>
            <h3>Massive event</h3>
            <h4>Monday - Friday</h4>
            <p>Some kind of music festival</p>
            <button>More information</button>
          </div>
        </div>
      </label>
    </div>
  </div>
</div>

CSS :

@import url(https://fonts.googleapis.com/css?family=Roboto+Condensed:400,700,300);
* {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

body {
  background: #45b98f;
  overflow: hidden;
  font-family: 'Roboto Condensed', sans-serif;
}
body .left {
  float: left;
  width: 50%;
  height: 100vh;
  position: Relative;
}
body .left_inner {
  width: 340px;
  margin: 0 auto;
  -webkit-transform: translateY(-50%);
          transform: translateY(-50%);
  height: 414px;
  position: absolute;
  right: 20px;
  top: 50%;
}
body .left_inner h1 {
  color: white;
  font-size: 28px;
  margin: 120px 0px 0px 0px;
}
body .left_inner h2 {
  color: #abe8d2;
  font-size: 22px;
  font-weight: 200;
  margin: 0px 0px 0px 0px;
}
body .right {
  float: right;
  position: relative;
  width: 50%;
  height: 100vh;
}

.app {
  border-radius: 10px;
  width: 340px;
  margin: 0 auto;
  height: 414px;
  position: absolute;
  left: 0;
  top: 50%;
  -webkit-box-shadow: 4px 5px 0px rgba(0, 0, 0, 0.11);
          box-shadow: 4px 5px 0px rgba(0, 0, 0, 0.11);
  -webkit-animation: intro 0.34s 0.4s cubic-bezier(1, 1.4, 0.41, 1.01) forwards;
          animation: intro 0.34s 0.4s cubic-bezier(1, 1.4, 0.41, 1.01) forwards;
  -webkit-transform: translateY(-50%) scale(0) rotateX(10deg) rotateY(10deg) rotateZ(10deg);
          transform: translateY(-50%) scale(0) rotateX(10deg) rotateY(10deg) rotateZ(10deg);
  margin: auto;
  overflow: hidden;
  font-family: 'Roboto Condensed', sans-serif;
}
.app_inner {
  position: relative;
}
.app_inner input[type="radio"] {
  display: none;
}
.app_inner input[type="radio"]:checked + label .app_inner__tab {
  height: 175px;
}
.app_inner input[type="radio"]:checked + label .app_inner__tab .tab_right {
  top: 39px;
  -webkit-transition: all 0.3s 0.2s cubic-bezier(0.455, 0.03, 0.515, 0.955);
  transition: all 0.3s 0.2s cubic-bezier(0.455, 0.03, 0.515, 0.955);
}
.app_inner input[type="radio"]:not(checked) + label .app_inner__tab {
  height: 80px;
  border-left: 12px solid rgba(0, 0, 0, 0.12);
}
.app_inner input[type="radio"]:not(checked) + label .app_inner__tab .tab_right {
  top: 200px;
  -webkit-transition: all 0.3s 0.3s cubic-bezier(0.455, 0.03, 0.515, 0.955);
  transition: all 0.3s 0.3s cubic-bezier(0.455, 0.03, 0.515, 0.955);
}
.app_inner input[type="radio"]:checked + label .app_inner__tab .tab_left .tab_left__image {
  -webkit-animation: move_in 0.55s 0.05s cubic-bezier(0.455, 0.03, 0.515, 0.955) forwards;
          animation: move_in 0.55s 0.05s cubic-bezier(0.455, 0.03, 0.515, 0.955) forwards;
  -webkit-transition: all 0.3s 0.36s cubic-bezier(0.455, 0.03, 0.515, 0.955);
  transition: all 0.3s 0.36s cubic-bezier(0.455, 0.03, 0.515, 0.955);
}
.app_inner input[type="radio"]:not(checked) + label .app_inner__tab .tab_left .tab_left__image {
  -webkit-animation: move_out 0.75s 0s cubic-bezier(0.455, 0.03, 0.515, 0.955) forwards;
          animation: move_out 0.75s 0s cubic-bezier(0.455, 0.03, 0.515, 0.955) forwards;
  -webkit-transition: all 0.3s 0.3s cubic-bezier(0.455, 0.03, 0.515, 0.955);
  transition: all 0.3s 0.3s cubic-bezier(0.455, 0.03, 0.515, 0.955);
}
.app_inner input[type="radio"]:checked + label .app_inner__tab .tab_left .big {
  left: 260px;
}
.app_inner input[type="radio"]:not(checked) + label .app_inner__tab .tab_left .big {
  left: 400px;
}
.app_inner input[type="radio"]:checked + label .app_inner__tab h2 i {
  opacity: 0;
}
.app_inner input[type="radio"]:not(checked) + label .app_inner__tab h2 i {
  opacity: .3;
}
.app_inner label {
  display: block;
  width: 100%;
}
.app_inner label:nth-of-type(1) .app_inner__tab {
  background: #99b998;
  height: 200px;
}
.app_inner label:nth-of-type(1) .app_inner__tab:hover {
  -webkit-transition: all .2s;
  transition: all .2s;
  background: #8db18c;
}
.app_inner label:nth-of-type(1) .app_inner__tab .tab_left__image {
  background: #EA495F;
}
.app_inner label:nth-of-type(2) .app_inner__tab {
  background: #E4B794;
}
.app_inner label:nth-of-type(2) .app_inner__tab:hover {
  -webkit-transition: all .2s;
  transition: all .2s;
  background: #e0ac84;
}
.app_inner label:nth-of-type(2) .app_inner__tab .tab_left__image {
  background: #99B998;
}
.app_inner label:nth-of-type(3) .app_inner__tab {
  background: #f4837d;
}
.app_inner label:nth-of-type(3) .app_inner__tab:hover {
  -webkit-transition: all .2s;
  transition: all .2s;
  background: #f2716a;
}
.app_inner label:nth-of-type(3) .app_inner__tab .tab_left__image {
  background: #E4B794;
}
.app_inner label:nth-of-type(4) .app_inner__tab {
  background: #ea495f;
}
.app_inner label:nth-of-type(4) .app_inner__tab:hover {
  -webkit-transition: all .2s;
  transition: all .2s;
  background: #e8374f;
}
.app_inner label:nth-of-type(4) .app_inner__tab .tab_left__image {
  background: #F4837D;
}
.app_inner__tab {
  width: 100%;
  height: 80px;
  background: red;
  cursor: pointer;
  overflow: hidden;
  position: relative;
  -webkit-transition: all 0.65s cubic-bezier(1, 0, 0.41, 1.01);
  transition: all 0.65s cubic-bezier(1, 0, 0.41, 1.01);
}
.app_inner__tab h2 {
  position: absolute;
  right: 20px;
  top: 16px;
  color: #1a1c1d;
  font-size: 18px;
}
.app_inner__tab h2 i {
  position: absolute;
  right: 271px;
  opacity: 0.3;
  -webkit-transition: all .3s;
  transition: all .3s;
}
.app_inner__tab .tab_right {
  width: 60%;
  float: right;
  position: relative;
  top: 200px;
  text-align: right;
  padding: 20px;
}
.app_inner__tab .tab_right h3, .app_inner__tab .tab_right h4, .app_inner__tab .tab_right p {
  margin: 0;
}
.app_inner__tab .tab_right h3 {
  font-size: 14px;
  color: rgba(0, 0, 0, 0.65);
}
.app_inner__tab .tab_right h4 {
  font-size: 12px;
  margin: 4px 0px;
  color: rgba(0, 0, 0, 0.33);
}
.app_inner__tab .tab_right p {
  font-size: 11px;
  color: white;
}
.app_inner__tab .tab_right button {
  margin-top: 10px;
  border: 2px solid white;
  background: none;
  border-radius: 5px;
  padding: 6px 20px;
  cursor: pointer;
  font-family: 'Roboto Condensed', sans-serif;
  outline: none;
  font-size: 11px;
  color: white;
  -webkit-transition: all .3s;
  transition: all .3s;
}
.app_inner__tab .tab_right button:hover {
  background: white;
  color: black;
}
.app_inner__tab .tab_left {
  width: 30%;
  float: left;
  position: relative;
}
.app_inner__tab .tab_left .big {
  position: absolute;
  top: -17px;
  -webkit-transition: all .3s .3s;
  transition: all .3s .3s;
  left: 390px;
  font-size: 180px;
  opacity: 0.08;
}
.app_inner__tab .tab_left__image {
  position: relative;
  top: -100px;
  text-align: center;
  background: white;
  left: 47px;
  border-radius: 20px;
  width: 80px;
  height: 80px;
}
.app_inner__tab .tab_left__image i {
  color: white;
  font-size: 40px;
  top: 18px;
  position: relative;
}

@-webkit-keyframes move_out {
  0% {
    top: 47px;
  }
  100% {
    top: 200px;
  }
}

@keyframes move_out {
  0% {
    top: 47px;
  }
  100% {
    top: 200px;
  }
}
@-webkit-keyframes move_in {
  0% {
    top: -200px;
  }
  100% {
    top: 47px;
  }
}
@keyframes move_in {
  0% {
    top: -200px;
  }
  100% {
    top: 47px;
  }
}
@-webkit-keyframes bump {
  0% {
    top: 16px;
  }
  25% {
    top: 13px;
  }
  50% {
    top: 16px;
  }
  75% {
    top: 13px;
  }
  100% {
    top: 16px;
  }
}
@keyframes bump {
  0% {
    top: 16px;
  }
  25% {
    top: 13px;
  }
  50% {
    top: 16px;
  }
  75% {
    top: 13px;
  }
  100% {
    top: 16px;
  }
}
@-webkit-keyframes intro {
  0% {
    -webkit-transform: translateY(-50%) scale(0) rotateX(10deg) rotateY(10deg) rotateZ(40deg);
            transform: translateY(-50%) scale(0) rotateX(10deg) rotateY(10deg) rotateZ(40deg);
  }
  100% {
    -webkit-transform: translateY(-50%) scale(1) rotateX(0deg) rotateY(0deg) rotateZ(0deg);
            transform: translateY(-50%) scale(1) rotateX(0deg) rotateY(0deg) rotateZ(0deg);
  }
}
@keyframes intro {
  0% {
    -webkit-transform: translateY(-50%) scale(0) rotateX(10deg) rotateY(10deg) rotateZ(40deg);
            transform: translateY(-50%) scale(0) rotateX(10deg) rotateY(10deg) rotateZ(40deg);
  }
  100% {
    -webkit-transform: translateY(-50%) scale(1) rotateX(0deg) rotateY(0deg) rotateZ(0deg);
            transform: translateY(-50%) scale(1) rotateX(0deg) rotateY(0deg) rotateZ(0deg);
  }
}
a.download, a.follow {
  text-align: center;
  margin-top: 13px;
  width: 300px;
  float: left;
  display: inline-block;
  padding: 16px 30px;
  background: #EA495F;
  color: white;
  font-weight: 900;
  font-family: 'Roboto Condensed', sans-serif;
  text-decoration: none;
  border-radius: 4px;
  margin-right: 12px;
}
a.download i, a.follow i {
  margin-right: 10px;
}

a.follow {
  float: left;
  padding: 14px 30px;
  background: none;
  color: white;
  border: 2px solid white;
}
a.follow:hover {
  color: #41EFB6;
  border-color: #41EFB6;
}