using Uninav div as parent stage, css adjustments

turned the uninav div back on so it is the parent stage, this is important as the previous iterations were using the page as parent.
also, i did not appreciate the power of css properties, i was taking care to set the properties in functions, but with the help of
classes and pseudo-classes we can predefine a great number of properties very easily. i will try to adjust to this different way
of doing things and utilize it more effectively.
removed bad array related function
event listener test for first tile

finally understand the first step for passing arg to function signatures to
eventlisteners
outline added to style, each element assigned event listener for mouseover