To customize the way your game looks, click the menu in the bottom-left, then Edit Story Stylesheet. In the stylesheet, you can write CSS code that will allow you to change the background color, the text color, the maximum size for pictures, and much more.
If you put the code background:lightblue; in the section after body { , it changes the background to light blue. Putting the code color:darkgreen; in the section after tw-story { changes the text color to darkgreen. The code img { max-width:600px; } says to the computer, "All images (pictures, animated gifs, etc.) should be 600 pixels wide or less."
Here is some basic CSS that can be used with Harlowe, the default Twine 2 theme.
P.S.
To remove the back arrow (I recommend it for Twine games) include this code in your CSS
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