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/*
 * Source: http://codepen.io/anon/pen/ZQLrQm
*/

h2 {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
  color: rebeccapurple;
  text-align: center;
}
h2:before, h2:after {
  -webkit-box-flex: 1;
  -webkit-flex: 1 0 20%;
      -ms-flex: 1 0 20%;
          flex: 1 0 20%;
  height: 3px;
  content: '';
  background-color: currentColor;
}
h2::before {
  margin-right: 10px;
}
h2::after {
  margin-left: 10px;
}
h2.left-aligned {
  text-align: left;
}
h2.left-aligned::before {
  -webkit-box-flex: 0;
  -webkit-flex: 0;
      -ms-flex: 0;
          flex: 0;
  margin-right: 0;
}
h2.right-aligned {
  text-align: left;
}
h2.right-aligned::after {
  -webkit-box-flex: 0;
  -webkit-flex: 0;
      -ms-flex: 0;
          flex: 0;
  margin-left: 0;
}

body {
  padding: 15px;
}

<!-- Source: http://codepen.io/anon/pen/ZQLrQm -->
<h2>This is a heading that is so long, it might as well break.</h2>
<h2 class="left-aligned">This is a heading that is so long, it might as well break.</h2>
<h2 class="right-aligned">This is a heading that is so long, it might as well break.</h2>

/*
 * Source: http://codepen.io/anon/pen/ZQLrQm
*/

h2 {
  display:flex;
  align-items: center;
  color: rebeccapurple;
  text-align:center;
  &:before, &:after {
    flex: 1 0 20%;
    height: 3px;
    content: '';
    background-color: currentColor;
  }
  &::before {
    margin-right:10px;
  }
  &::after {
    margin-left:10px;
  }
  &.left-aligned {
    text-align:left;
  }
  &.left-aligned::before {
    flex:0;
    margin-right: 0;
  }
  &.right-aligned {
    text-align:left;
  }
  &.right-aligned::after {
    flex:0;
    margin-left: 0;
  }
}

body {
  padding: 15px;
}