If you have logged into your Twitter account and created a Twitter timeline widget, you can alter various properties so it displays how you want. From the Twitter documentation here are a few tips:
To create a timeline you must be signed in to twitter.com and visit the widgets section of your settings page.
For sites where the theme and link color do not provide enough customization to make the Tweets feel like they’re a part of the page, Twitter offers a set of additional client side customization features. These settings allow you to control the background color, borders, header, and footer of the timeline. Continue reading