I read about using a child theme to make it fast and easy to modify a WordPress theme. I followed directions and created a directory with a file style.css containing the following
/*
Theme Name: IBD Page
Description: IBD Page is based on Twenty Sixteen
Template: twentysixteen
*/
@import url(../twentysixteen/style.css);
article header h1 {font-size:3em}
article header h1 {color:blue}
However, the element only partly changes. The color changes to blue, but the font-size does not. I tried a few different font sizes.
Why didn't that work?
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Arthur gave the correct answer, below. For those that get here, the following works for this problem when using a child of the Twenty Sixteen theme.
/*
Theme Name: IBD Page
Description: IBD Page is based on Twenty Sixteen
Template: twentysixteen
*/
@import url(../twentysixteen/style.css);
/* Making the article titles 20 point */
.content-area .site-main article header h1,
article .entry-header .entry-title a
{ font-size: 20pt; }