style.css

body {
        font-family: 'Rubik', 'Segoe UI', 'Open Sans', 'Helvetica Neue', sans-serif;
        font-size: calc(10px + 0.33vw);
        -webkit-font-smoothing: antialiased;
        padding: 5vh 10vw;
        color: #121314;
      }
      h1 {
        font-size: 4.5em;
        font-weight: 500;
        margin-bottom: 0;
      }
      p {
        font-size: 1.6em;
        font-weight: 300;
        line-height: 1.4;
        max-width: 28em;
      }
      a {
        text-decoration: none;
        color: #121314;
        position: relative;
      }
      a:after {
        content: '';
        position: absolute;
        z-index: -1;
        top: 60%;
        left: -0.1em;
        right: -0.1em;
        bottom: 0;
        transition: top 200ms cubic-bezier(0, 0.8, 0.13, 1);
        background-color: rgba(79, 192, 141, 0.5);
      }
      a:hover:after {
        top: 0%;
}