index.css

/*
$base-dark: #202040;
$base-dark-contrast: #602080;
$base-mid: #202060;
$base-mid-contrast: #b030b0;
$dark-theme-link: #77FFAE;
$dark-theme-warning-link: #FF471B; */

hr {
  border-color: #77FFAE;
  margin: 1.5em auto;
}

html {
  box-sizing: border-box;
  font-size: 16px;
}
*, *:before, *:after {
  box-sizing: inherit;
}
body {
  background-color: #202060;
  color: white;
  font-size: 1rem;
  font-family: Helvetica, sans-serif;
  height: 100%;
  line-height: 2;
  margin: 0;
  padding: 0;
  width: 100%;
  }
  a {
    color: #77FFAE;
    text-decoration: none;
  }

  button {
    background-color: #602080;
    border-color: #b030b0;
    color: white;
    cursor: pointer;
    letter-spacing: 1px;
    padding: 1em;
    text-decoration: none;
    text-transform: capitalize;
  }
  button:hover {
    background-color: #b030b0;
    box-shadow: 0 0 5px #b030b0;
    font-weight: bold;
  }
  button:focus {
    box-shadow: 0 0 5px #b030b0;
  }