fathom/assets/sass/styles.scss

body {
  font-family: Arial, Verdana, sans-serif;
  font-size: 14px;
  color: #333;
}

h1, h2, h3 {
  color: #111;
}

.container {
  max-width: 1020px;
  padding: 0 20px;
}

table {
  border-collapse: collapse;

  th, td {
    border: 1px solid #eee;
    padding: 4px 8px;
  }
}