code {
font-family: Consolas,"courier new";
color: crimson;
background-color: rgba(0, 0, 0, 0.2);
padding: 2px;
font-size: 105%;
}
apt-cache search linux-headers
If not there, use the build framework to create your own set of kernel packages including headers: https://docs.armbian.com/Developer-Guide_Build-Preparation/