modal.js

Meteor.startup(function () {
  var body = $('body');

  body.on('click', '.md-trigger', function (event) {
    $( '#' + $(event.currentTarget).attr( 'data-modal' ) ).addClass('md-show');
    body.addClass('modal');
  });

  body.on('click', '.md-overlay, .md-close', function (event) {
    body.removeClass('modal');
    $('.md-show').removeClass('md-show');
  });

  body.prepend("<div class='md-overlay'></div>");
});

Modal.jsx

Modal = React.createClass({
  render () {
    return (
      <div className="md-modal md-effect-1" id="modal-1">
        <div className="md-content">
          <h3>{this.props.title}</h3>
          <div className="md-body">
            {this.props.content}
            <i className="md-close close ion ion-close"></i>
          </div>
        </div>
      </div>
    )
  }
});

Modal.scss

.md-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 50%;
  max-width: 630px;
  min-width: 320px;
  height: auto;
  z-index: 2000;
  visibility: hidden;
  backface-visibility: hidden;
  transform: translateX(-50%) translateY(-50%);
}

.md-show {
  visibility: visible;
}

.md-overlay {
  position: fixed;
  width: 100%;
  height: 100%;
  visibility: hidden;
  top: 0;
  left: 0;
  z-index: 1000;
  opacity: 0;
  background: rgba(74, 133, 212, 0.57);
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

.modal .md-overlay {
  opacity: 1;
  visibility: visible;
}

.md-content {
  color: #fff;
  background: $primary-color;
  position: relative;
  border-radius: 3px;
  margin: 0 auto;
  h3 {
    margin: 0;
    padding: 0.4em;
    text-align: center;
    font-size: 2.4em;
    font-weight: 300;
    opacity: 0.8;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px 3px 0 0;
  }
  .md-body {
    padding: 15px 40px 30px;
    margin: 0;
    font-weight: 300;
    font-size: 1.15em;
  }
  .close {
    position: absolute;
    top: -31px;
    right: 0;
    border: solid 1px #fff;
    width: 25px;
    height: 25px;
    text-align: center;
    line-height: 25px;
    border-radius: 360px;
    cursor: pointer;
  }
  button {
    border: none;
    padding: 0.6em 1.2em;
    background: $primary-color;
    color: #fff;
    font-family: 'Open Sans', Calibri, Arial, sans-serif;
    font-size: 1em;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    display: inline-block;
    margin: 3px 2px;
    border-radius: 2px;
    &:focus {
      outline: 0;
    }
  }
}

.md-effect-1 .md-content {
  -webkit-transform: scale(0.7);
  -moz-transform: scale(0.7);
  -ms-transform: scale(0.7);
  transform: scale(0.7);
  opacity: 0;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

.md-show.md-effect-1 .md-content {
  -webkit-transform: scale(1);
  -moz-transform: scale(1);
  -ms-transform: scale(1);
  transform: scale(1);
  opacity: 1;
}