CSS Mock for our modal component

style.css

.modal {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 990;
}

.modal .overlay {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 995;
  background: rgba(0,0,0,0.85);
}

.modal .modal_content {
  z-index: 999;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-height: 90%;
  overflow: auto;
  background: #fff;
  box-sizing: border-box;
  padding: 20px;
  box-shadow: 0 1px 5px rgba(0,0,0,0.7);
  border-radius: 4px;
  width: 520px; /* This just a default width */
}

.modal .modal_content > h2 {
  font-size: 28px;
  font-weight: 200;
  margin: 20px 0 40px;
  text-align: center;
}

.modal .modal_content .buttons_wrapper {
  padding: 20px;
}

.modal .close_modal {
  position: absolute;
  right: 10px;
  top: 10px;
  cursor: pointer;
  font-size: 18px;
  opacity: 0.5;
  background: none;
  border: none;
  transition: opacity 0.2s ease;
}

.modal .close_modal:hover {
  opacity: 0.9;
}