When you create a survey using SharePoint, you stand to gain from many built-in features in it and the choice of themes is one of them. SharePoint allows you to customize the look and feel of your survey in just a few easy steps, using any of the different themes within.
1) First go to your SharePoint site.
2) Go to your survey page.
3) Go to Change the look option under the settings gear icon in the top right-hand corner of the page.
4) Select the theme of your choice.
5) And the look and feel of your survey page will be changed as shown below: