react-responsive-modal/styles.css

.react-responsive-modal-overlay {
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: flex-start;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 1000;
  padding: 1.2rem;
}

.react-responsive-modal-modal {
  max-width: 800px;
  position: relative;
  padding: 1.2rem;
  background: #ffffff;
  background-clip: padding-box;
  box-shadow: 0 12px 15px 0 rgba(0, 0, 0, 0.25);
  margin: 0 auto;
}

.react-responsive-modal-modalCenter {
  margin: auto;
}

.react-responsive-modal-closeButton {
  position: absolute;
  top: 14px;
  right: 14px;
  border: none;
  padding: 0;
  cursor: pointer;
  background-color: transparent;
  display: flex;
}

@keyframes react-responsive-modal-fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes react-responsive-modal-fadeOut {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}