p5.js-web-editor/client/styles/components/_overlay.scss

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
  background-color: rgba(0, 0, 0, 0.5);
  overflow-y: hidden;
}

.overlay__content {
  height: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.overlay__body {
  @extend %modal;
  display: flex;
  flex-wrap: wrap;
  flex-flow: column;
  max-height: 80%;
  max-width: 65%;
}

.overlay__header {
  display: flex;
  justify-content: space-between;
  padding: #{40 / $base-font-size}rem #{20 / $base-font-size}rem #{30 / $base-font-size}rem #{20 / $base-font-size}rem;
  flex: 1 0 auto;
}

.overlay__close-button {
  @include icon();
  padding: #{12 / $base-font-size}rem #{16 / $base-font-size}rem;
}