By default, the "Hot Air Balloon" theme will be applied to your dashboard. You can change it by accessing the Theme menu in the overflow in the top right-hand corner.
In this sample, we will use the Admirable theme. Select Theme in the previous dialog, and then choose the corresponding thumbnail.
For your visualization to match the sample widget’s color, go to the Visualization Editor. Then, go to Settings and change the Start Color to the sixth one.
Once you have finished editing the visualization, select the tick button in the top right-hand corner to return to the dashboard editor.