koel/resources/assets/sass/partials/_mixins.scss

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

@mixin artist-album-wrapper() {
    justify-content: space-between;
    flex-wrap: wrap;
    display: flex;
}

@mixin artist-album-card() {
    .item {
        flex-direction: column;
        margin-bottom: 16px;
        width: 23.5%;
        position: relative;

        @media only screen and (max-width: 1200px) {
            width: 32%;
        }

        @media only screen and (max-width: 960px) {
            width: 48%;
        }

        @media only screen and (max-width: 320px) {
            width: 100%;
        }

        html.with-extra-panel & {
            width: 32%;

            @media only screen and (max-width: 1200px) {
                width: 48%;
            }

            @media only screen and (max-width: 960px) {
                width: 100%;
            }
        }

        .cover {
            @include vertical_center();

            background-repeat: no-repeat;
            background-size: cover;
            background-position: center center;
            width: 100%;
            padding-top: 100%;
            position: relative;

            .control {
                $playBtnWidth: 96px;
                display: none;
                width: $playBtnWidth;
                height: $playBtnWidth;
                text-align: center;
                line-height: $playBtnWidth;
                font-size: 54px;
                background: #111;
                border-radius: 50%;
                text-indent: 5px;
                opacity: .7;
                border: 1px solid transparent;
                position: absolute;
                top: 50%;
                transform: translateY(-50%);
                left: calc(50% - #{$playBtnWidth/2});

                transition: .3s;

                &:hover {
                    opacity: 1;
                    border-color: #fff;
                    transform: translateY(-50%) scale(1.1);
                }

                html.touchevents & {
                    display: block;
                }
            }

            &:before {
                content: " ";
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                z-index: 0;
                transition: .3s;
            }

            &:hover {
                &:before {
                    background-color: rgba(0, 0, 0, .4);
                }

                .control {
                    display: block;
                }
            }
        }

        footer {
            padding: 16px;
            background: #333;
            flex: 1;
        }

        .name {
            font-weight: 500;
        }

        .meta {
            color: $color2ndText;
            margin-top: 4px;
            font-size: 12px;
        }

        a.name, a.artist {
            display: block;
            color: $colorMainText;

            &:hover {
                color: $colorHighlight;
            }
        }
    }
}

@mixin inset-when-pressed() {
    &:active {
        box-shadow: inset 0px 10px 10px -10px rgba(0,0,0,1);
    }
}

@mixin button-group() {
    display: flex;
    position: relative;
    min-width: 192px;
    justify-content: flex-end;

    button {
        $buttonHeight: 28px;

        font-size: 12px;
        height: $buttonHeight;
        padding: 0 16px;
        line-height: $buttonHeight;
        text-transform: uppercase;
        display: inline-block;

        border-radius: $buttonHeight/2 0px 0px $buttonHeight/2;

        &:last-of-type {
            border-top-right-radius: $buttonHeight/2;
            border-bottom-right-radius: $buttonHeight/2;
        }

        &:not(:first-child) {
            border-top-left-radius: 0;
            border-bottom-left-radius: 0;
            margin-left: 1px;
        }

        i {
            margin-right: 4px;
        }
    }
}

@mixin context-menu() {
    font-weight: $fontWeight_Thin;
    font-size: $fontSize;
    padding: 4px 0;
    min-width: 144px;
    color: #111;
    background-color: rgb(232, 232, 232);
    position: fixed;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    flex-direction: column;
    z-index: 1001;
    align-items: stretch;
    text-align: left;
    box-shadow: inset 0 0px 0 rgba(255,255,255,.6), 0 22px 70px 4px rgba(0,0,0,0.56), 0 0 0 1px rgba(0, 0, 0, 0.3);

    input[type="search"], input[type="text"], input[type="email"], input[type="url"] {
        background: #fff;

        &:focus {
            background: $colorDirtyInputBgr;
        }
    }
}