Can't get my second header color to stay constant

Quick question…I’m using the Figero theme and I went in to the Custom CSS to change the second header. Worked great for the first page, but then it switches back to the blue on the other pages, where I want that lighter gray scale. Below is what I put in. Is this incorrect? Anyone have any advice? Thanks, Stacey

https://www.redshieldtech.com

.second-header {
background:#999999;
border-style:none;
body {
color:black;
font-family:Arial,Helvetica,Georgia,Sans-serif;
font-size:12px;
margin:0;
text-align:left;
vertical-align:top;