Foundation Responsive Design Helper

_helper.scss

.rwd-helper {
    position: fixed;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 25px;
    background: black;
    color: white;
    line-height: 25px;
    text-align: center;
    text-transform: uppercase;
    font-size: 12px;

    &:before {
        @each $breakpoint in $breakpoints {
            @include breakpoint( $breakpoint ) {
                content: '#{$breakpoint} up';
            }
        }
    }
}

index.html

<div class="rwd-helper"></div>