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CSS

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HTML 

              
                <div class="gif">
  <iframe src="https://giphy.com/embed/l0ErBfFLUMPoq3WbC" width="100%" height="100%" frameBorder="0" class="giphy-embed" allowFullScreen></iframe>
  <p>Get to know <a href="http://bts.ibighit.com" target="_blank" rel="noopener noreferrer">BTS</a>, your Top Social Artist at the Billboard Music Awards 2018</p>
</div>
<div class="boxes">
  <details id="bts">
    <summary>BTS<span class="realname">(Bangtan Boys)</span></summary>
    <ul class="info">
      <li>7-member boyband from South Korea, active since 2013</li>
      <li><a href="https://www.youtube.com/watch?v=GEIU_7v40Dw" target="_blank" rel="noopener noreferrer">Really</a> <a href="https://www.youtube.com/watch?v=sWuYspuN6U8" target="_blank" rel="noopener noreferrer">good</a> <a href="https://www.youtube.com/watch?v=_AlODdAInRY" target="_blank" rel="noopener noreferrer">at</a> <a href="https://www.youtube.com/watch?v=vJwHIpEogEY" target="_blank" rel="noopener noreferrer">dancing</a></li>
      <li>Has a <a href="https://open.spotify.com/artist/3Nrfpe0tUJi4K4DXYWgMUX" target="_blank" rel="noopener noreferrer">great discography</a> with <a href="https://genius.com/artists/Bts" target="_blank" rel="noopener noreferrer">~deep~ lyrics</a></li>
      <li>Won Top Social Artist at Billboard Music Awards 2017 & 2018</li>
      <li>Has a literal army of fans called ARMY, who will flood your social media if you mention BTS, 0/10 do not recommend</li>
    </ul>
  </details>
  <details id="rm">
    <summary>RM<span class="realname">(Kim Namjoon)</span></summary>
    <ul>
      <li>Born in 1994, rapper of the group</li>
      <li>The only one in the group who speaks decent English</li>
      <li>Is supposedly very smart</li>
      <li>But also very clumsy and forgetful, prone to losing his passport, among other things</li>
      <li>Tend to sound fake deep but actually just very sweet and nice</li>
    </ul>
  </details>
  <details id="jin">
    <summary>JIN<span class="realname">(Kim Seokjin)</span></summary>
    <ul>
      <li>Born in 1992, vocalist + resident good looking guy of the group</li>
      <li>The only one in the group who goes to actual college, majored in acting</li>
      <li>Is very (VERY!!!) proud of his face</li>
      <li><a href="https://twitter.com/Shazam/status/998371896813993984/photo/1" target="_blank" rel="noopener noreferrer">Randomly blows kisses</a> to the camera and is very funny in general</li>
      <li>Constantly makes Korean dad jokes</li>
    </ul>
  </details>
  <details id="suga">
    <summary>SUGA<span class="realname">(Min Yoongi)</span></summary>
    <ul>
      <li>Born in 1993, rapper of the group</li>
      <li>Is very!!! passionate about music it's so endearing</li>
      <li>Has an amazing mixtape titled <a href="https://open.spotify.com/album/2nz4nG3HiOUkceO1NYvJnP" target="_blank" rel="noopener noreferrer">Agust D</a></li>
      <li>Looks like he'd rather die than be here 99% of the time</li>
      <li>Makes the <a href="https://giphy.com/gifs/yoongi-xYkOXpNXnjRsI" target="_blank" rel="noopener noreferrer">best</a> <a href="https://giphy.com/gifs/bangtan-boys-sonyeondan-22pSte4vdGvok" target="_blank" rel="noopener noreferrer">meme</a> <a href="https://giphy.com/gifs/kpop-gif-jungkook-3LJ7AQcTvYP8k" target="_blank" rel="noopener noreferrer">faces</a></li>
    </ul>
  </details>
  <details id="jhope">
    <summary>j-hope<span class="realname">(Jung Hoseok)</span></summary>
    <ul>
      <li>Born in 1994, rapper + dancer of the group</li>
      <li>Also the moodmaker of the group</li>
      <li>Probably the <a href="https://www.youtube.com/watch?v=dj42sqcbnCg" target="_blank" rel="noopener noreferrer">best dancer</a> you'd ever see in your lifetime</li>
      <li>Generally super happy and hyper and loud it's embarassing</li>
      <li>Scared of anything and everything</li>
    </ul>
  </details>
  <details id="jimin">
    <summary>Jimin<span class="realname">(Park Jimin)</span></summary>
    <ul>
      <li>Born in 1995, vocalist + dancer of the group</li>
      <li>Was a dance student, supposedly so good that his teachers urged him not to be in a boyband</li>
      <li>Really hardworking and tends to be hard on himself</li>
      <li>Tweets a lot</li>
      <li>Supposedly used to be top of the class, best student, etc</li>
    </ul>
  </details>
  <details id="v">
    <summary>V<span class="realname">(Kim Taehyung)</span></summary>
    <ul>
      <li>Born in 1995, vocalist + resident look-good-in-anything guy of the group</li>
      <li>Likes and sings jazzy and easy listening music</li>
      <li>Prone to wearing questionable fashion, but THAT FACE saves it</li>
      <li>Is a very sweet and soft kid but also gets annoyed easily</li>
      <li>Has a Leica and I am very jealous</li>
    </ul>
  </details>
  <details id="jungkook">
    <summary>Jungkook<span class="realname">(Jeon Jungkook)</span></summary>
    <ul>
      <li>Born in 1997, vocalist + dancer + baby of the group</li>
      <li>Is good at anything except studying</li>
      <li>Supposedly <a href="https://www.reddit.com/r/Overwatch/comments/7tymfj/massive_kpop_group_bts_12m_twitter_followers_just/" target="_blank" rel="noopener noreferrer">plays Overwatch like a pro</a></li>
      <li>Great at <a href="https://www.youtube.com/watch?v=PMEkmiQP5bg" target="_blank" rel="noopener noreferrer">editing videos</a> and <a href="https://www.youtube.com/watch?v=VLzRQCIZrmE" target="_blank" rel="noopener noreferrer">covering songs</a></li>
      <li>Joined the group when he was 16, considers himself raised by the group</li>
    </ul>
  </details>
</div>
!

CSS 

              
                @GAP: 10px;
:root{
  --name-top:200px;
  --list-top:170px;
  --row-height:250px;
  --open-right-top:-20px;
  --max-width:500px;
}

body{
  background:#fcfcfc;
}

a{
  border-bottom:1px solid #1c826c;
  color:#1c826c;
  position:relative;
  text-decoration:none;
  top:0;
  transition:all .5s;
  &:hover,&:focus{
    border-bottom-width:2px;
    outline:none;
    padding-bottom:2px;
    top:-3px;
  }
}

.open-right{
  grid-row:span 1;
  grid-column:span 2;

  background-size:49.5% auto;
  ul{
    border-left:0;
    border-top:1px solid #cfcfcf;
    margin-top:var(--open-right-top);
    margin-left:50.5%; 
  }
  summary{
    top:0;
    left:40%;
    ~ * {
      animation: fadeInRight .5s ease-in-out;
    }
  }
}

.open-bottom{
  background-size:auto var(--row-height);
  ul{
    margin-left:0;
    margin-top:var(--list-top);
    padding-top:@GAP*2; 
  }
}

body{
  font-family:"Varela Round","Nunito","Calibri",sans-serif;
  max-width:var(--max-width);
  margin:0 auto;
}

.gif{
  box-sizing:border-box;
  margin:0 auto;
  max-width:500px;
  padding:@GAP*3;
  width:100%;
  text-align:center;
}

.boxes{
  display:grid;
  grid-template-columns:1fr;
  grid-template-rows:repeat(9,minmax(var(--row-height),auto));
  grid-gap:@GAP;
  
  margin:@GAP auto;
  
  list-style:none;
  padding:0 @GAP*2;
  
  transition:all .5s;
}

.boxes details{
  background-position:center center;
  background-repeat:no-repeat;
  background-size:cover;
  border-radius:5px;
  
  filter: grayscale(100%);
  
  transition:all .5s;
  transition:background-size 0s;
  transition:filter 1s;
  
  &:hover,&:focus{
    cursor:pointer;
    filter:grayscale(70%);
  }
  
  &[open]{
    background-position:top left;
    filter: grayscale(0%);
    grid-row:span 2;
    
    summary{
      font-size:1.5em;
      transform:rotate(0deg);
      top:var(--name-top);
      
      .realname{
        opacity:1;
        max-height:50px;
        max-width:200px;
      }
       ~ * {
        animation: fadeIn .5s ease-in-out;
      }
    }
    .open-bottom();
  }
  
  summary{
    background:black;
    border:3px solid transparent;
    border-radius:3px;
    color:white;
    display:inline-block;
    margin:@GAP/2 @GAP;
    padding:@GAP @GAP*2;
    top:0;left:0;
    transform:rotate(-15deg);
    transition:all .5s;
    z-index:100;
    
    position:relative;
    left:-1.75*@GAP;
    
    .realname{
      display:block;
      font-size:14px;
      overflow:hidden;
      opacity:0;
      max-height:0;
      max-width:0;
      transition:all .5s;
      transition-delay:.5s;
    }

    &::-webkit-details-marker {
      display:none; 
    }
    &:first-of-type {
      list-style-type: none;
    }
    
    &:hover{
      cursor:pointer;
    }
    
    &:focus{
      border:3px solid #1ADBB1;
      outline:none;
    }
  }
  
  ul{
    border:1px solid #cfcfcf;
    border-radius:5px;
    border-top:0;
    padding:@GAP;
    list-style:none;
    transition:all .5s;
    
    li{
      padding:@GAP @GAP/2;
      &:nth-child(2){
        animation-delay:1s;
        -webkit-animation-delay:1s;
      }
      &:nth-child(3){
        animation-delay:2s;
        -webkit-animation-delay:2s;
      }
      &.nth-child(4){
        animation-delay:3s;
        -webkit-animation-delay:3s;
      }
      &.nth-child(5){
        animation-delay:4s;
        -webkit-animation-delay:4s;
      }
    }
  } 
}

#bts{
  background-image:url("https://bts.ibighit.com/images/bts/profile/profile-kv.png");
}
#v{
  background-image:url("https://bts.ibighit.com/images/bts/profile/member-v.jpg");
}
#suga{
  background-image:url("https://bts.ibighit.com/images/bts/profile/member-suga.jpg");
}
#jhope{
  background-image:url("https://bts.ibighit.com/images/bts/profile/member-jhope.jpg");
}
#jungkook{
  background-image:url("https://bts.ibighit.com/images/bts/profile/member-jk.jpg");
}
#jin{
  background-image:url("https://bts.ibighit.com/images/bts/profile/member-jin.jpg");
}
#jimin{
  background-image:url("https://bts.ibighit.com/images/bts/profile/member-jimin.jpg");
}
#rm{
  background-image:url("https://bts.ibighit.com/images/bts/profile/member-rm.jpg");
}

@media(min-width:600px) and (max-width:900px){
  :root{
    --open-right-top:-30px;
    --max-width:none;
  }
  .boxes{
    grid-template-columns:1fr 1fr;
  }
  
  .boxes details{
   &:nth-child(odd)[open]{
      .open-right();
    }
  }
}

@media(min-width:900px){
  :root{
    --name-top:150px;
    --list-top:120px; 
    --row-height:200px;
    --max-width:1200px;
  }
  
  .boxes{
    grid-template-columns:1fr 1fr 1fr;
  } 
  .boxes details{
    &:nth-child(7)[open],&:nth-child(8)[open]{
      .open-right();
    }
  }
}

@keyframes fadeIn{
  from{
    opacity:0;
    margin-left:-10px;
  }
  to{
    opacity:1;
    margin-left:0px;
  }
}

@keyframes fadeInRight{
  from{
    opacity:0;
    margin-left:25%;
  }
  to{
    opacity:1;
    margin-left:50.5%;
  }
}
!

JS 

              
                $(function(){
  
  //enable clicking anywhere on details
  $("details").click(function(){
    $(this).find("summary").click();
  })
  
  //block propagation so it doesn't trigger details click
  $("details summary,details a").click(function(e){
    e.stopPropagation();
  })
  
  //close the other details when opening one
  $("summary").click(function(){
    $("details").not($(this).parent()).removeAttr("open");
  })
})
!
999px

Console