A focal point is a center of interest on your web page. Contrast is a difference in the hue, value, size, scale, texture, etc. between design elements.
To get people to look at your focal point before anything else, design it to have the greatest contrast on the page. For example, if your color scheme includes shades of blue, white, and gray, a call-to-action that is bright orange will never be overlooked.
Creating Focal Points in Your Web Design by Mohammad Moradi