RJS not updating styles

<LgTextWh>"<%=h q.text %>" by <%=h q.author %>, <%=h q.year
%></LgTextWh>

css doesn't work that way. you can't define your own tags, you can
create style classes or apply styles to specific elements via the
element itself or an id attribute

ex:

/* class style */
.i-am-a-class {
  font-size: 1.2em;
}

/* all h1 tags get this style */
h1 {
  font-size: 1.6em;
}

/* style via id attribute*/
#menu {
  text-align: left;
}

<span class="i-am-a-class">...</span>

<h1>...</h1>

<div id="menu">...</div>

so from what you have posted, you probably want something like:

.LgTextWh {font-size:125%; font-weight: normal; color: white}

<span class="LgTextWh">"<%=h q.text %>" by <%=h q.author %>, <%=h q.year
%></span>