.js-is-desktop-pixel,
.js-is-tablet-pixel,
.js-is-mobile-pixel {
    position: fixed;
    top: 0;
    left: 0;
    height: 1px;
    width: 1px;
    display: none;
    background: none;
}

.js-is-mobile-pixel {
    @include sd-viewport($sd-mobile) {
        display: block;
    }
}

.js-is-tablet-pixel {
    @include sd-viewport($sd-tablet) {
        display: block;
    }
}

.js-is-desktop-pixel {
    @include sd-viewport($sd-desktop) {
        display: block;
    }
}