pxt-core/react-common/styles/palette/PaletteSwatch.less

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.common-palette-swatch {
    display: flex;
    flex-direction: row;
}

.common-palette-color-list {
    display: flex;
    flex-direction: row;
    :last-child {
        border: 1px solid #000;
    }
}

.common-palette-color {
    width: 1rem;
    height: 1rem;
    border-top: 1px solid #000;
    border-bottom: 1px solid #000;
    border-left: 1px solid #000;
}

.common-palette-swatch-name {
    flex-grow: 1;
    padding-right: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 12rem;
}

.common-palette-picker > .common-dropdown > .common-button .common-button-label .common-palette-color-list {
    display: none;
}

.common-palette-picker > .common-dropdown > .common-button .common-button-flex {
    display: flex;
}

.common-palette-picker > .common-dropdown > .common-menu-dropdown-pane {
    max-height: 35rem;
    overflow-y: auto;
    overflow-x: hidden;
    ul > li > .common-button.common-dropdown-item {
        padding: .75rem;
    }
}