<h1><span>SHE SELLS SEASHELLS ON THE SEASHORE.
</span></h1>
h1 {
  max-width: 300px;
  font-family: Verdana;
}

h1 span {
  background: blue;
  color: white;
  padding: 12px 12px;
  line-height: 1.4;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

/* Just for centering */
body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}
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