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HTML

              
                <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-simple">simple</button>
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-long">long content</button>
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-large">large</button>
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-small">small</button>
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-form">form</button>
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-form-long">long form</button>


<div id="modal-simple" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="modal-simple__label" aria-hidden="true">
  <div class="modal-dialog modal-dialog-slideover" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="modal-simple__label">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

<div id="modal-long" class="modal fade show" tabindex="-1" role="dialog" aria-labelledby="modal-long__label" aria-hidden="true">
  <div class="modal-dialog modal-dialog-slideover" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="modal-long__label">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">×</span>
        </button>
      </div>
      <div class="modal-body">
        <p>Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
        <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p>
        <p>Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
        <p>Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
        <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p>
        <p>Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
        <p>Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
        <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p>
        <p>Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
        <p>Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
        <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p>
        <p>Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
        <p>Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
        <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p>
        <p>Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
        <p>Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
        <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p>
        <p>Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

<div id="modal-large" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="modal-large__label" aria-hidden="true">
  <div class="modal-dialog modal-dialog-slideover modal-lg" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="modal-large__label">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

<div id="modal-small" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="modal-small__label" aria-hidden="true">
  <div class="modal-dialog modal-dialog-slideover modal-sm" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="modal-small__label">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

<div id="modal-form" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="modal-form__label" aria-hidden="true">
  <div class="modal-dialog modal-dialog-slideover" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="modal-form__label">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <form action="#" class="modal-form">
        <div class="modal-body">
          <div class="form-group">
            <label for="exampleInputEmail1">Email address</label>
            <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter email">
            <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
          </div>
          <div class="form-group">
            <label for="exampleInputPassword1">Password</label>
            <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
          </div>
          <div class="form-group form-check">
            <input type="checkbox" class="form-check-input" id="exampleCheck1">
            <label class="form-check-label" for="exampleCheck1">Check me out</label>
          </div>
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
          <button type="submit" class="btn btn-primary">Submit</button>
        </div>
      </form>
    </div>
  </div>
</div>

<div id="modal-form-long" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="modal-form-long__label" aria-hidden="true">
  <div class="modal-dialog modal-dialog-slideover" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="modal-form-long__label">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <form action="#" class="modal-form">
        <div class="modal-body">
          <div class="form-group">
            <label for="exampleInputEmail1">Email address</label>
            <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter email">
            <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
          </div>
          <div class="form-group">
            <label for="exampleInputPassword1">Password</label>
            <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
          </div>
          <div class="form-group form-check">
            <input type="checkbox" class="form-check-input" id="exampleCheck1">
            <label class="form-check-label" for="exampleCheck1">Check me out</label>
          </div>
          <div class="form-group">
            <label for="exampleFormControlInput1">Email address</label>
            <input type="email" class="form-control" id="exampleFormControlInput1" placeholder="name@example.com">
          </div>
          <div class="form-group">
            <label for="exampleFormControlSelect1">Example select</label>
            <select class="form-control" id="exampleFormControlSelect1">
              <option>1</option>
              <option>2</option>
              <option>3</option>
              <option>4</option>
              <option>5</option>
            </select>
          </div>
          <div class="form-group">
            <label for="exampleFormControlSelect2">Example multiple select</label>
            <select multiple class="form-control" id="exampleFormControlSelect2">
              <option>1</option>
              <option>2</option>
              <option>3</option>
              <option>4</option>
              <option>5</option>
            </select>
          </div>
          <div class="form-group">
            <label for="exampleFormControlTextarea1">Example textarea</label>
            <textarea class="form-control" id="exampleFormControlTextarea1" rows="3"></textarea>
          </div>
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
          <button type="submit" class="btn btn-primary">Submit</button>
        </div>
      </form>
    </div>
  </div>
</div>
              
            
!

CSS

              
                .modal-dialog.modal-dialog-slideover {
  margin: 0;
  margin-left: auto;
  // max-width: 80%;

  .modal.fade & {
    transform: translate(100%, 0);
  }
  .modal.fade.show & {
    transform: translate(0, 0);
    flex-flow: column;
  }
  & .modal-content {
    border: 0;
    border-radius: 0;
    height: 100vh;
  }
  & .modal-body {
    max-height: 100%;
    overflow-y: auto;
  }
  & .modal-form {
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
  }
}

body { margin: 3rem }
              
            
!

JS

              
                
              
            
!
999px

Console