_mixins.scss

@mixin respond-from($min) {
    @media (min-width: $min) {
        @content;
    }
}

@mixin respond-until($max) {
    @media (max-width: $max - 1) {
        @content;
    }
}

@mixin respond-between($min, $max) {
    @media (min-width: $min) and (max-width: $max - 1) {
        @content;
    }
}

@mixin wh($width, $height: none) {
    width: $width;

    @if($height == none) {
        height: $width;
    } @else {
        height: $height;
    }
}

@mixin pos($coords...) {
    @if length($coords) == 1 {
        // All positions get the same value
        top: nth($coords, 1);
        right: nth($coords, 1);
        bottom: nth($coords,1);
        left: nth($coords, 1);
    } @else if length($coords) == 2 {
        // Only give left/top (x,y)
        left: nth($coords, 1);
        top: nth($coords, 2);
    } @else {
        // Give positions in top-right-bottom-left order
        top: nth($coords, 1);
        right: nth($coords, 2);
        bottom: nth($coords, 3);
        left: nth($coords, 4);
    }
}

@mixin clearfix {
    &:after {
        content: "";
        display: table;
        clear: both;
    }
}

@mixin background-center($size: cover) {
    background-size: $size;
    background-repeat: no-repeat;
    background-position: center center;
}

@mixin transform-center-horizontal {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

@mixin transform-center-vertical {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

@mixin transform-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@mixin flex-center($direction: column) {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: $direction;
}

@mixin margin-center {
    margin-left: auto;
    margin-right: auto;
}

@mixin child-margins($spacing: $valenski-base-unit) {
    > * + * {
        margin-top: $spacing;
    }
}

// From Bootstrap 4:
// https://github.com/twbs/bootstrap/blob/master/scss/mixins/_screen-reader.scss
@mixin sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important; // Fix for https://github.com/twbs/bootstrap/issues/25686
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}