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.btn {
  font-family: sans-serif;
  font-weight: 400;
  max-width: 240px;
  display: block;
  height: 65px;
  line-height: 65px;
  margin: auto;
  color: #fff;
  position: relative;
  border: none;
  cursor: pointer;
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4);
  &--outline {
    border: 3px solid #3884FF;
    color: #3884FF;
  }
  &.btn--slide {
    span,
    .icon {
      display: block;
      height: 100%;
      text-align: center;
      position: absolute;
      top: 0;
    }
    span {
      width: 72%;
      line-height: inherit;
      font-size: 18px;
      font-weight: 600;
      left: 10px;
      transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4);
      &:after {
        content: '';
        width: 2px;
        height: 70%;
        position: absolute;
        top: 15%;
        right: -1px;
      }
    }
    .icon {
      display: flex;
      width: 28%;
      right: 10px;
      transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4);
      .fa {
        margin: auto;
        font-size: 24px;
        vertical-align: middle;
        transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4), height 0.25s ease;
      }
    }
    &:hover {
      span {
        left: 0;
        opacity: 0;
      }
      .icon {
        width: 100%;
        right: 0;
      }
    }
  }
}

<!-- Font Awesome library -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.0/css/font-awesome.min.css">

<a href="#" class="btn btn--outline btn--slide" role="button">
  <span>Learn More</span>
  <div class="icon"><i class="fa fa-long-arrow-right"></i></div>
</a>