display current breakpoint in lower left page

_display-breakpoints.scss

@mixin display-breakpoints {
  &:after {
    content: "xs";
    position: fixed;
    width: 30px;
    font-size: 12px;
    text-align: center;
    background-color: black;
    color: lime;
    bottom: 0;
    left: 0;
    text-shadow: 0 0 4px #fff, 0 0 10px #fff, 0 0 15px #fff;
  }

  @media only screen and (min-width: 576px) and (max-width: 767px) {
    &:after {
      content: "sm";
    }
  }

  @media only screen and (min-width: 768px) and (max-width: 991px) {
    &:after {
      content: "md";
    }
  }

  @media only screen and (min-width: 992px) and (max-width: 1199px) {
    &:after {
      content: "lg";
    }
  }

  @media only screen and (min-width: 1200px) and (max-width: 1399px) {
    &:after {
      content: "xl";
    }
  }

  @media only screen and (min-width: 1400px) {
    &:after {
      content: "xxl";
    }
  }
}