remove space between paragraph and unordered list

You can use CSS selectors in a way similar to the following:

p + ul {
    margin-top: -10px;
}

This could be helpful because p + ul means select any <ul> element after a <p> element.

You’ll have to adapt this to how much padding or margin you have on your <p> tags generally.

Original answer to original question:

p, ul {
    padding: 0;
    margin: 0;
}

That will take any EXTRA white space away.

p, ul {
    display: inline;
}

That will make all the elements inline instead of blocks. (So, for instance, the <p> won’t cause a line break before and after it.)