html classes and id attributes code example

Example 1: html id

<style>
#grepperHeader {
  background-color: lightblue;
  color: navy;
  padding: 40px;
  text-align: center;
}
</style>

<h1 id="grepperHeader">grepperHeader</h1>

Example 2: css calss

.ThisIsAClassName{
  font-family: sans-serif;
}