Styling Pseudo element ::after shows no line-wrap

I wanted to create an underline effect for the Headings for my blog using css. For that, I used the Pseudo element ::after for styling and was able to achieve the following results

The problem arises when the length of the Headings exceed the single line length, it doesn't follow the wrap-around effect like the one shown below.

The css style I used to generate this effect is

// styles.sass
h1::after, 
h2::after
  position: absolute
  margin-top: -0.45em
  margin-left: -10px
  display: block
  width: 107%
  height: 0.5em
  background: #EFF239  
  content: ''
  z-index: -1
  border-bottom: 2px solid #ddd
h2::after
  background: #a5f1b1

Could someone guide me, how I could also style the ::after element such that the underline follows the Heading text ?

Don't use pseudo element, rely on box-shadow:

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-css -->

span {
  font-size: 30px;
  padding: 0 10px;
  box-shadow: 0 -.4em 0 #EFF239 inset;
  -webkit-box-decoration-break: clone;
}

<!-- language: lang-html -->

<span>Some text here <br> and here</span>

<!-- end snippet -->