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   .z-tree-icon .z-tree-open {

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     background-size: cover;

     width: 100%;

   }

   .z-tree-icon .z-tree-close {

     background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAxBJREFUeNqcVc9PE0EU/mZ3S1OogUILxEgsiAonGr2IBwMcjCdP3jxr1MRADybeOEkwHgoxUYP/hQfDCYgH8aKBE2iAQvjZUqCRQi3t7PjtTuVn0xgmeTv75r33zZt935sVKDHUZEOYUy+lixI5ZZ6iTFCGRWdi8XSsOAP2tSEGq6oPdT1AsBvwNZ90yMaB1DiwNQYU9obE7US0JKD9JVRDbVwEbkbQ/BSwGoo7ZJ3Hkbvw6ddCAoi/h9r5PkVzt3FnM30IaI8FXTCEbkVEy2OueomRQdkh/PTJQS2MAJvfNGhPKm25SdiqXwTaI6LpLndew/+NTY3LGJVLR9TOTD/VqJCjtWFY3rjR8YipLvOorId9ACyOArvLOtZ/Sc+ZFT1faALC9wCjggmwLkYT7OmPfM81G0ravahpBQ5mgRyN+XVg6TMQegh0J7TUPdDyT3dsjo/j68Q4scRwsCwUVJeormf1ZotHYcDBNtTlKGoDAXdle2fHnY/rYm2YMTyB3OLKFkT1VahV1WUpqSKCmWMvxYfkB/XwCBJZ+6i2zjtwUq+kDwobzJIJwISoIiCxLEi6SRplXnvLVdolxMprzCd1ZmJpwJ0Pddpg5oA/qw5HtLgYCpYqENCWekEjsjDkc2IAvvVXRYpouvqSg1o3qHusYzFwMRwsZmhDZ2nwTIUjB4O6UYY10j7GSauIYcMg6pTa/c3FgHY6jzDWwXCwSBs1IRMksxk6PyBjHQwHS/wZ8YZhmHHvjU7SZaFYNeD+E4G1ZOnTXiTLPn0o1tzDnq9oQe7HpPMdm92vnX3niZm1wT7P9XZ2wzQ5wT6tbyvfeUnydp/97u9A/ucM5HZqyPcsH9WAb60akmzcrG+MeFrZNdl5ZpsoD1jBzHxXkJ+bg0xuTPFy6fY9L6QPr6/9mKlB64IRz7U22rl7jsQ9IOFVkR7CJFAQ8DbS1Y/8r1k2SsoFq4zKdMkLdv+NiMG0+syGRl6JjTD8/hN2O5PhVbjBInAzWRiqfKGiZW9sZ+wNIswUyv8CBIarXuLML+CvAAMASDyP6pmxxvMAAAAASUVORK5CYII=);

   /*background-image: url('https://az545221.vo.msecnd.net/skype-faq-media/faq_content/skype/screenshots/fa12330/emoticons/speechless_20.png');*/

     background-size: cover;

     width: 100%;

   }

   /*remove the font awesome icon*/

   .z-tree-icon .z-tree-open::before,

   .z-tree-icon .z-tree-close::before {

     content: '';

   }

  </style>

<tree id="tree" width="400px" rows="8">

    <treecols sizable="true">

        <treecol label="Name" />

        <treecol label="Description" />

    </treecols>

    <treechildren>

        <treeitem>

            <treerow>

                <treecell label="Item 1" />

                <treecell label="Item 1 description" />

            </treerow>

        </treeitem>

        <treeitem>

            <treerow>

                <treecell label="Item 2" />

                <treecell label="Item 2 description" />

            </treerow>

            <treechildren>

                <treeitem>

                    <treerow>

                        <treecell label="Item 2.1" />

                    </treerow>

                    <treechildren>

                        <treeitem>

                            <treerow>

                                <treecell label="Item 2.1.1" />

                            </treerow>

                        </treeitem>

                        <treeitem>

                            <treerow>

                                <treecell label="Item 2.1.2" />

                            </treerow>

                        </treeitem>

                    </treechildren>

                </treeitem>

                <treeitem>

                    <treerow>

                        <treecell label="Item 2.2" />

                    </treerow>

                    <treechildren>

                        <treeitem>

                            <treerow>

                                <treecell label="Item 2.2.1" />

                            </treerow>

                        </treeitem>

                    </treechildren>

                </treeitem>

            </treechildren>

        </treeitem>

        <treeitem label="Item 3" />

    </treechildren>

</tree></zk>