ZRZYQC/UI2/public/assets/esri/themes/base/_Ui.scss

.esri-ui {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  box-sizing: border-box;
  pointer-events: none;
  overflow: hidden;
  font-size: $font-size;
  z-index: 0; // creates root stacking context

  .esri-component {
    pointer-events: auto;
  }

  /* attribution's position is a special case */
  .esri-attribution {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
  }
}

.esri-ui-corner {
  position: absolute;
  display: flex;
}

.esri-ui-inner-container {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
}

.esri-ui-manual-container {
  & > .esri-component {
    position: absolute;
  }

  /* swipe needs to be placed behind all UI components */
  .esri-swipe {
    z-index: -1;
  }
}

// Top Corners
.esri-ui-top-left,
.esri-ui-top-right {
  flex-flow: column;
}

.esri-ui-top-left {
  align-items: flex-start;
}

.esri-ui-top-right {
  align-items: flex-end;
}

//  Bottom Corners
.esri-ui-bottom-left,
.esri-ui-bottom-right {
  flex-flow: row;
  align-items: flex-end;
}

.esri-ui-bottom-right {
  flex-flow: row-reverse;
}

.esri-ui-top-left {
  top: 0;
  left: 0;
}

.esri-ui-top-right {
  top: 0;
  right: 0;
}

.esri-ui-top-right .esri-component,
.esri-ui-top-left .esri-component {
  margin-bottom: $view-ui-spacing;
}

.esri-ui-bottom-left {
  bottom: 0;
  left: 0;

  .esri-component {
    margin-right: $view-ui-spacing;
  }
}

.esri-ui-bottom-right {
  bottom: 0;
  right: 0;

  .esri-component {
    margin-left: $view-ui-spacing;
  }
}

[dir="rtl"] {
  .esri-ui-top-left {
    align-items: flex-end;
  }
  .esri-ui-top-right {
    align-items: flex-start;
  }
  .esri-ui-bottom-left {
    flex-direction: row-reverse;
  }
  .esri-ui-bottom-right {
    flex-direction: row;
  }
}

/* ZoomBox */

.esri-zoom-box__container {
  position: relative;
  height: 100%;
  width: 100%;
}

.esri-zoom-box__overlay {
  cursor: crosshair;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.esri-zoom-box__overlay-background {
  fill: rgba(0, 0, 0, 0.1);
}

.esri-zoom-box__outline {
  fill: transparent;
  stroke: dodgerblue;
  stroke-dasharray: 1, 1;
  stroke-width: 2px;
}