图像不会固定在平板电脑屏幕尺寸和更小的中心

I am attempting to fix a personal website project where I have a image that refuses to be centered on mobile/tablet screen sizes. I have tried all manner of custom css but to no avail.I have quite a few media queries at different sizes, however I can't find any conflicting styles.I am using the bootstrap framework on this project. The website is I am attempting to fix a personal website proje