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Change the height of grid header

could you please inform me how to increase the height of the header of the grid.and give color to the columns.

The height of header defined by content, basically you can adjust grid's css

dhtmlxgrid.css
    div.gridbox table.hdr td {
          height: 40px; // or any other necessary value.

>>and give color to the columns
You can define colors of header by using third parameter of setHeader command
      http://dhtmlx.com/docs/products/kb/index.shtml?cat=search&page=1&q=1827&ssr=yes&s=header%20color
or by adding necessary value to the same css class.

Please check
    http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Headers_and_footers.html