fixing up menu.  More clean up.  In class work.
Outline of topics covered in the HTML/CSS class.
Merge branch 'master' of https://github.com/guyjin/htmlClass
added <dt> <dd> tag styles.
Finished HTML section, added to CSS notes..
converted .md version of Targets file to pdf.
moved Colors to CSS section, added multiple bg link, added Effects section to CSS
New practice files.  Flex layout experiements and CSS based baseball diamond.
sample images and one page build for layout exercises.