r - How to center an image in a shiny app? -

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i playing app:

http://shiny.rstudio.com/gallery/plot-plus-three-columns.html

i inserting picture on top row inserting beneath 'title'

list(img(src="nfl_header.jpg", width = 400, align = "center")),

but left justified, align doesn't seem anything. how specify center justification image?

from yihui himself:

the align attribute of <img /> not need. different thing (http://www.w3schools.com/tags/att_img_align.asp). can use style="display: block; margin-left: auto; margin-right: auto;" center image. or div(img(...), style="text-align: center;").


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