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HTML 

              
                <h4>Fusce vehicula egestas ex</h4>
<div class="accordeon">
  <div class="acc">
    <input type="radio" name="accDuvidas" id="accDuvidas-1" />
    <label for="accDuvidas-1">Duis vestibulum nisl id nulla placerat?</label>
    <p>Integer placerat ipsum tortor, dignissim malesuada tellus volutpat in. Praesent posuere elit at volutpat cursus. Phasellus malesuada, eros sit amet gravida mollis, lectus orci porttitor metus, ac ultricies erat lorem non elit.</p>
  </div>
  <div class="acc">
    <input type="radio" name="accDuvidas" id="accDuvidas-2" />
    <label for="accDuvidas-2">Nullam ut placerat risus?</label>
    <p>Pellentesque nisi lorem, laoreet eu nisi ultricies, convallis hendrerit erat. Etiam ac ipsum nec nisi congue viverra sed at dolor. Phasellus id porttitor diam. Duis nec ornare felis. Duis ac odio dolor. Nullam egestas felis eu sapien semper congue. Integer convallis pharetra magna quis dictum. Nam ut massa eget neque mattis tempor vel quis turpis. Quisque non interdum urna. Quisque rhoncus feugiat est, scelerisque commodo sapien. Maecenas diam est, finibus vel mattis id, porttitor quis augue.<br><br>In eget erat erat. Aliquam rhoncus, eros at laoreet vulputate, leo diam cursus lacus, vitae auctor massa dolor vel urna. Morbi convallis ornare sagittis. Ut efficitur dui nibh, lobortis aliquet purus tempus sed.</p>
  </div>
  <div class="acc">
    <input type="radio" name="accDuvidas" id="accDuvidas-3" />
    <label for="accDuvidas-3">Duis accumsan lacinia sollicitudin?</label>
    <p>Fusce massa tortor, ullamcorper eu dictum a, molestie vel ipsum. Vivamus vel ex eu leo vestibulum mattis. Aenean lorem sapien, rutrum quis pharetra vitae, aliquam eget velit. Nulla in purus vel diam blandit tempor. Pellentesque feugiat nec risus ut faucibus. Nulla maximus a magna in semper. Maecenas cursus tincidunt dolor, ut eleifend dolor pulvinar vel. Nunc in eros ac justo tincidunt fringilla.</p>
  </div>
  <div class="acc">
    <input type="radio" name="accDuvidas" id="accDuvidas-4" />
    <label for="accDuvidas-4">Class aptent taciti?</label>
    <p>Maecenas ac consectetur diam, vitae consequat ex. Quisque eget pellentesque libero. Donec euismod orci ut interdum aliquet. Suspendisse ut eros facilisis, placerat dui quis, tempor nisi. Maecenas vitae arcu nunc. Nullam suscipit neque felis, eget tempor nunc vestibulum quis. Donec rutrum ornare erat in semper. Phasellus lacinia, augue id fermentum fermentum, erat purus pretium velit, quis ultrices lorem neque vitae arcu.<br><br>Maecenas ut orci eu nisl gravida tincidunt at eu magna. Maecenas rhoncus lacus nibh, a hendrerit lectus lacinia at. Mauris egestas vulputate mi a ornare. Cras tempor semper dui, sit amet posuere nisi mollis sed.<br><br>Integer tincidunt quam nec interdum suscipit. Quisque et euismod leo, vel fermentum ligula.</p>
  </div>
</div>
!

CSS 

              
                @import 'https://fonts.googleapis.com/css?family=Rufina:700|Open+Sans:400,700';

h4 {
  font-family: 'Rufina';
  font-weight: 700;
  font-size: 2em;
  margin: 1em 0;
  text-align: center;
}



.accordeon {
  display: flex;
  flex-wrap: wrap;
  margin: -0.5em auto;
  width: 90%;
  max-width: 60em;
  .acc {
    flex: 1 0 29em;
    margin: 0.5em;
    font-family: 'Open Sans', sans-serif;
    display: flex;
    flex-direction: column;
    input {
      display: none;
      &:checked{
        ~ p {
          font-size: 14px;
          opacity: 1;
      transition: font-size 300ms 0ms ease-in, opacity 300ms 300ms ease-in;
        }
      }
    }
    label {
      font-weight: bold;
      text-transform: uppercase;
      font-size: 16px;
      padding: .5em 1em;
      cursor: pointer;
    }
    p {
      font-size: 0;
      line-height: 1.25;
      padding: 1rem;
      opacity: 0;
      transition: font-size 300ms 300ms ease-in, opacity 300ms 0ms ease-in;
    }
  }
}
!

JS
!
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