Demo modal styles for micromodal.js and corresponding expected html. If using this, set the `awaitCloseAnimation` in config to true

micromodal.css

/**************************\
  Basic Modal Styles
\**************************/

.modal {
  font-family: -apple-system,BlinkMacSystemFont,avenir next,avenir,helvetica neue,helvetica,ubuntu,roboto,noto,segoe ui,arial,sans-serif;
}

.modal__overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  justify-content: center;
  align-items: center;
}

.modal__container {
  background-color: #fff;
  padding: 30px;
  max-width: 500px;
  max-height: 100vh;
  border-radius: 4px;
  overflow-y: auto;
  box-sizing: border-box;
}

.modal__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal__title {
  margin-top: 0;
  margin-bottom: 0;
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.25;
  color: #00449e;
  box-sizing: border-box;
}

.modal__close {
  background: transparent;
  border: 0;
}

.modal__header .modal__close:before { content: "\2715"; }

.modal__content {
  margin-top: 2rem;
  margin-bottom: 2rem;
  line-height: 1.5;
  color: rgba(0,0,0,.8);
}

.modal__btn {
  font-size: .875rem;
  padding-left: 1rem;
  padding-right: 1rem;
  padding-top: .5rem;
  padding-bottom: .5rem;
  background-color: #e6e6e6;
  color: rgba(0,0,0,.8);
  border-radius: .25rem;
  border-style: none;
  border-width: 0;
  cursor: pointer;
  -webkit-appearance: button;
  text-transform: none;
  overflow: visible;
  line-height: 1.15;
  margin: 0;
  will-change: transform;
  -moz-osx-font-smoothing: grayscale;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  transition: -webkit-transform .25s ease-out;
  transition: transform .25s ease-out;
  transition: transform .25s ease-out,-webkit-transform .25s ease-out;
}

.modal__btn:focus, .modal__btn:hover {
  -webkit-transform: scale(1.05);
  transform: scale(1.05);
}

.modal__btn-primary {
  background-color: #00449e;
  color: #fff;
}



/**************************\
  Demo Animation Style
\**************************/
@keyframes mmfadeIn {
    from { opacity: 0; }
      to { opacity: 1; }
}

@keyframes mmfadeOut {
    from { opacity: 1; }
      to { opacity: 0; }
}

@keyframes mmslideIn {
  from { transform: translateY(15%); }
    to { transform: translateY(0); }
}

@keyframes mmslideOut {
    from { transform: translateY(0); }
    to { transform: translateY(-10%); }
}

.micromodal-slide {
  display: none;
}

.micromodal-slide.is-open {
  display: block;
}

.micromodal-slide[aria-hidden="false"] .modal__overlay {
  animation: mmfadeIn .3s cubic-bezier(0.0, 0.0, 0.2, 1);
}

.micromodal-slide[aria-hidden="false"] .modal__container {
  animation: mmslideIn .3s cubic-bezier(0, 0, .2, 1);
}

.micromodal-slide[aria-hidden="true"] .modal__overlay {
  animation: mmfadeOut .3s cubic-bezier(0.0, 0.0, 0.2, 1);
}

.micromodal-slide[aria-hidden="true"] .modal__container {
  animation: mmslideOut .3s cubic-bezier(0, 0, .2, 1);
}

.micromodal-slide .modal__container,
.micromodal-slide .modal__overlay {
  will-change: transform;
}

micromodal.html

  <div class="modal micromodal-slide" id="modal-1" aria-hidden="true">
    <div class="modal__overlay" tabindex="-1" data-micromodal-close>
      <div class="modal__container" role="dialog" aria-modal="true" aria-labelledby="modal-1-title">
        <header class="modal__header">
          <h2 class="modal__title" id="modal-1-title">
            Micromodal
          </h2>
          <button class="modal__close" aria-label="Close modal" data-micromodal-close></button>
        </header>
        <main class="modal__content" id="modal-1-content">
          <p>
            Try hitting the <code>tab</code> key and notice how the focus stays within the modal itself. Also, <code>esc</code> to close modal.
          </p>
        </main>
        <footer class="modal__footer">
          <button class="modal__btn modal__btn-primary">Continue</button>
          <button class="modal__btn" data-micromodal-close aria-label="Close this dialog window">Close</button>
        </footer>
      </div>
    </div>
  </div>

I'm looking to only be able to close the modal with the Yes button and not with the ESC key or by clicking away from the modal. Have you done anything like that?

It looks like elements that have the data-micromodal-close attribute trigger the close, so you'll want to remove that from modal__overlay and add it to your Yes button. As far as the ESC button goes, I cannot say.

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