Random Sass mixins I've made for myself.

Mixins

@mixin bg($url, $color: transparent, $repeat: no-repeat, $position: center center, $size: contain) {
    background: $color url($url) $repeat $position;
    background-size: $size;
}

@mixin size($width, $height: $width) {
    width: $width;
    height: $height;
}