DW Focus featured image, is possible resizing automatically?

Hi !
 – In our themes, featured images in articles are set as default, if you want to change the sizes of images, Login to Dashboard > theme option > add the following code lines:
 
<style>
.single .site-content > .post .entry-thumbnail img {
  width: 700px;
 
  height: 400px;
}
</style>

Regards,

Dominic