static/styles/themes/custom-golden-layout-themes/pink.scss

// based on https://github.com/golden-layout/golden-layout/blob/v1.5.9/src/less/goldenlayout-dark-theme.less

$lighter: #fae1fa;
$base: #fac6fa;
$dark: #e3a5e3;

// Color variables (appears count calculates by raw css)
$color0: $dark; // Appears 7 times
$color1: $base; // Appears 3 times
$color2: #eeeeee; // Appears 2 times
$color3: #333; // Appears 2 times

$color4: #cccccc; // Appears 1 time
$color5: darken($dark, 5%); // Appears 1 time
$color6: #999999; // Appears 1 time
$color7: $dark; // Appears 1 time
$color8: #452500; // Appears 1 time
$color9: #555555; // Appears 1 time
$color10: #ffffff; // Appears 2 time

// ".lm_dragging" is applied to BODY tag during Drag and is also directly applied to the root of the object being dragged

// Entire GoldenLayout Container, if a background is set, it is visible as color of "pane header" and "splitters" (if these latest has opacity very low)
.lm_goldenlayout {
    background: $color0;
}

// Single Pane content (area in which final dragged content is contained)
.lm_content {
    background: $lighter;
}

// Single Pane content during Drag (style of moving window following mouse)
.lm_dragProxy {
    .lm_content {
        box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.9);
    }
}

// Placeholder Container of target position
.lm_dropTargetIndicator {
    box-shadow: inset 0 0 30px $color0;
    outline: 1px dashed $color4;
    transition: all 200ms ease;

    // Inner Placeholder
    .lm_inner {
        background: $color0;
        opacity: 0.2;
    }
}

// Separator line (handle to change pane size)
.lm_splitter {
    background: $color0;
    opacity: 0.001;
    transition: opacity 200ms ease;

    &:hover, // When hovered by mouse...
  &.lm_dragging {
        background: $color5;
        opacity: 1;
    }
}

// Pane Header (container of Tabs for each pane)
.lm_header {
    height: 20px;
    user-select: none;

    &.lm_selectable {
        cursor: pointer;
    }

    // Single Tab container. A single Tab is set for each pane, a group of Tabs are contained in ".lm_header"
    .lm_tab {
        font-family: Arial, sans-serif;
        font-size: 12px;
        color: $color6;
        background: $color7;
        box-shadow: 2px -2px 2px rgba(0, 0, 0, 0.3);
        margin-right: 2px;
        padding-bottom: 2px;
        padding-top: 2px;

        /*.lm_title         // Present in LIGHT Theme
    {
      padding-top:1px;
    }*/

        // Close Tab Icon
        .lm_close_tab {
            width: 11px;
            height: 11px;
            background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAcAAAAHCAYAAADEUlfTAAAAIklEQVR4nGNgYGD4z4Ad/Mdg4ODDBXCZRFgCp5EEHQMXBwAQAgz0SVCcggAAAABJRU5ErkJggg==);
            background-position: center center;
            background-repeat: no-repeat;
            top: 4px;
            right: 6px;
            opacity: 0.4;

            &:hover {
                opacity: 1;
            }
        }

        // If Tab is active, so if it's in foreground
        &.lm_active {
            border-bottom: none;
            box-shadow: 0 -2px 2px $color0;
            padding-bottom: 3px;

            .lm_close_tab {
                opacity: 1;
            }
        }
    }
}

.lm_dragProxy.lm_bottom,
.lm_stack.lm_bottom {
    .lm_header .lm_tab {
        box-shadow: 2px 2px 2px rgba(0, 0, 0, 0.3);
        &.lm_active {
            box-shadow: 0 2px 2px $color0;
        }
    }
}

// If Pane Header (container of Tabs for each pane) is selected (used only if addition of new Contents is made "by selection" and not "by drag")
.lm_selected {
    .lm_header {
        background-color: $color8;
    }
}

.lm_tab {
    &:hover, // If Tab is hovered
  &.lm_active // If Tab is active, so if it's in foreground
    {
        background: $color1;
        color: $color3;
    }
}

// Dropdown arrow for additional tabs when too many to be displayed
.lm_header .lm_controls .lm_tabdropdown:before {
    color: $color10;
}

// Pane controls (popout, maximize, minimize, close)
.lm_controls {
    // All Pane controls shares these
    > li {
        position: relative;
        background-position: center center;
        background-repeat: no-repeat;
        opacity: 0.4;
        transition: opacity 300ms ease;

        &:hover {
            opacity: 1;
        }
    }

    // Icon to PopOut Pane, so move it to a different Browser Window
    .lm_popout {
        background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAJCAYAAADgkQYQAAAANUlEQVR4nI2QMQoAMAwCz5L/f9mOzZIaN0E9UDyZhaaQz6atgBHgambEJ5wBKoS0WaIvfT+6K2MIECN19MAAAAAASUVORK5CYII=);
    }

    // Icon to Maximize Pane, so it will fill the entire GoldenLayout Container
    .lm_maximise {
        background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAJCAYAAADgkQYQAAAAIklEQVR4nGNkYGD4z0AAMBFSAAOETPpPlEmDUREjAxHhBABPvAQLFv3qngAAAABJRU5ErkJggg==);
    }

    // Icon to Close Pane and so remove it from GoldenLayout Container
    .lm_close {
        background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAJCAYAAADgkQYQAAAAKUlEQVR4nGNgYGD4z4Af/Mdg4FKASwCnDf8JKSBoAtEmEXQTQd8RDCcA6+4Q8OvIgasAAAAASUVORK5CYII=);
    }
}

// If a specific Pane is maximized
.lm_maximised {
    // Pane Header (container of Tabs for each pane) can have different style when is Maximized
    .lm_header {
        background-color: $color0;
    }

    // Pane controls are different in Maximized Mode, especially the old Icon "Maximise" that now has a different meaning, so "Minimize" (even if CSS Class did not change)
    .lm_controls {
        .lm_maximise {
            background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAJCAYAAADgkQYQAAAAJklEQVR4nGP8//8/AyHARFDFUFbEwsDAwMDIyIgzHP7//89IlEkApSkHEScJTKoAAAAASUVORK5CYII=);
        }
    }
}

.lm_transition_indicator {
    background-color: $color0;
    border: 1px dashed $color9;
}

// If a specific Pane is Popped Out, so move it to a different Browser Window, Icon to restore original position is:
.lm_popin {
    cursor: pointer;

    // Background of Icon
    .lm_bg {
        background: $color10;
        opacity: 0.3;
    }

    // Icon to Restore original position in Golden Layout Container
    .lm_icon {
        background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA0AAAAJCAYAAADpeqZqAAAAWklEQVR4nJWOyw3AIAxDHcQC7L8jbwT3AlJBfNp3SiI7dtRaLSlKKeoA1oEsKSQZCEluexw8Tm3ohk+E7bnOUHUGcNh+HwbBygw4AZ7FN/Lt84p0l+yTflV8AKQyLdcCRJi/AAAAAElFTkSuQmCC);
        background-position: center center;
        background-repeat: no-repeat;
        border-left: 1px solid $color2;
        border-top: 1px solid $color2;
        opacity: 0.7;
    }

    &:hover {
        .lm_icon {
            opacity: 1;
        }
    }
}