controlling the sizes and alignment of your images using css keeps rules that effect the presentation of your page in the css and out of the HTML markup
Controlling the size of images
you can control the size of an image by usinf the width and size properties in css
for example:
img.large{
width: 500px;height: 500px;
}
there are any things you can do like aligning, centering, background, repeating,background position. whatever fits your needs