Digith Tempate builder integrated 400 textures to match your need, you can click the small thumbnail img to add texture to your email, and sure you can choose none to cancel the bg.
You can input url for the background, note: please input the right url for the img.
You can drag the Slider to change the value to change the divider height.
You can drag the Slider to change the value to add or change the radius effect for the button or other prebuild elements.