Bootstrap media query indicator
body:after {
position:fixed;
display:block;
bottom:0;
right:0;
padding:1em;
background:rgba(0,0,0,.7);
color:#fff;
content:'XS';
@media (min-width:$screen-sm-min) {
content:'SM';
}
@media (min-width:$screen-md-min) {
content:'MD';
}
@media (min-width:$screen-lg-min) {
content:'LG';
}
}