pxt-core/react-common/styles/controls/Tree.less

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.common-tree {
    display: flex;
    flex-direction: column;
}

.common-tree.subtree .common-treeitem {
    // The width of the chevron is 1.81rem + 0.25rem margin
    padding-left: 2.06rem;
}

.common-treeitem {
    display: flex;
    flex-direction: row;
    align-items: center;

    height: 3rem;
    cursor: pointer;

    background-color: var(--pxt-neutral-background1);

    text-wrap: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
}

.common-treeitem:hover {
    filter: grayscale(.15) brightness(.85) contrast(1.3);
}

.common-treeitem-container {
    display: flex;
    flex-direction: column;
}