Post Font Size – I feel like an idiot!

I feel like an absolute idiot but I have tried everything (or so it seems) to change the font size in my posts in Twenty Sixteen. I have made so many edits on this theme and that is the one thing that no matter what I add to to my child theme, will not change. The Post Title size easily changed when I added the code, but the page and post font will not change. Obviously, I am doing something wrong. Currently I have this in regards to font size.

.entry-title, .entry-title a {
font-size: 24px !important;
font-weight: 400 !important;
}

.entry-content {
font-size: 16px !important;
font-weight: 400 !important;

}

I had other things, but after playing with it a while this is all that is left. Does anyone have any ideas? Help is appreciated!

http://www.petersonsintexas.com is the blog. I am just not a big fan of such large post text.

I do have google fonts installed and there is (sadly) no option to make them any smaller. I feel like an idiot as this seems like such an easy thing compared to everything else I have changed. Thanks in advance!