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<h1><span>あのイーハトーヴォのすきとおった風</span></h1>

h1 {
  overflow: hidden;
  text-align: center;
}
h1 span {
  position: relative;
  display: inline-block;
  margin: 0 2.5em;
  padding: 0 1em;
  text-align: left;
}
h1 span::before,
h1 span::after {
  position: absolute;
  top: 50%;
  content: '';
  width: 400%;
  height: 1px;
  background-color: #ccc;
}
h1 span::before {
  right: 100%;
}
h1 span::after {
  left: 100%;
}