.post-navigation {
  display: flex;
}

.post-navigation .nav-next {
  width: 50%;
  text-align: right;
}

.post-navigation .nav-previous {
  width: 50%;
}

.post-navigation .nav-next .next:before {
  display: none;
}

.post-navigation .nav-next .next:after {
  font-family: GeneratePress;
  text-decoration: inherit;
  position: relative;
  margin-left: .6em;
  width: 13px;
  text-align: center;
  display: inline-block;
  content: "\f105";
   -moz-osx-font-smoothing: grayscale;
     -webkit-font-smoothing: antialiased;
  font-style: normal;
  font-variant: normal;
  text-rendering: auto;
  line-height: 1;
  speak: none;
}

Mit GP SVG

.post-navigation {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
	margin-top: 20px;
	font-size: 120%;
	text-decoration: underline;
}

.post-navigation .nav-next, .post-navigation .nav-previous {
  width: 50%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: reverse;
      -ms-flex-direction: row-reverse;
          flex-direction: row-reverse;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.post-navigation .nav-previous {
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
      -ms-flex-direction: row;
          flex-direction: row;
}

.entry-meta .nav-next .gp-icon {
  margin-right: 0;
  margin-left: .6em;
}

.entry-meta .gp-icon {
	font-size: 20px;
}