react-email-builder/src/components/DropArea/index.less

A simple React drag and drop email builder.

.REB-DropArea {
  --border-width: 2px;

  z-index: 2;
  position: absolute;
  top: 1px;
  right: 0;
  bottom: 1px;
  left: 0;

  &-dragover {
    z-index: 3;
  }

  &-border {
    position: absolute;
    z-index: 1;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    border: var(--border-width) dashed var(--reb-drop-area-border-color);
  }

  &-active {
    border: var(--border-width) dashed var(--reb-drop-area-active-border-color);
  }

  &-top {
    border-top-width: 4px;
    border-top-style: solid;
  }

  &-bottom {
    border-bottom-width: 4px;
    border-bottom-style: solid;
  }

  &-text {
    --offset: -8px;
    position: absolute;
    z-index: 2;
    display: none;
    height: 20px;
    background: transparent;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0;

    span {
      display: inline-block;
      background: var(--reb-drop-area-active-border-color);
      color: var(--reb-drop-area-text-color);
      padding: 0 8px;
      font-size: 12px;
      line-height: 20px;
      border-radius: 10px;
    }

    &-visible {
      display: block;
    }

    &-top {
      top: var(--offset);
    }

    &-bottom {
      bottom: var(--offset);
    }

    &-center {
      top: 50%;
      transform: translateY(-10px);
    }
  }
}