Create a header with a line running behind it. Includes html and css required

line-behind-header.html

        <!--

        ADD CSS TO STYLE SHEETS TO USE
.line-container {
  position: relative;
    text-align: center;
z-index:10;
}
.line-container:before {
  content: "";
  display: block;
  position: absolute;
  z-index: -1;
  top: 50%;
  width: 100%;
  border-bottom: 3px solid black;
}
.line-container span {
    text-align: center;
    background-color: white;
    padding: 0 0.3em;

}
  -->
        <h2 class="line-container">
        <span>Hello World</span>
        </h2>