#blank-slate {
  display: flex;
  justify-content: center;

  .header {
    max-width: 400px;
    align-self: center;

    text-align: center;

    .title {
      font-size: var(--font-size-md);
      font-weight: var(--font-weight-semibold);
    }
  }

  .content,
  .footer {
    display: flex;
    flex-direction: row;
    align-self: center;
  }

  .content {
    margin: var(--spacing-double);
  }

  .callout {
    display: flex;
    flex-direction: column;

    max-width: 370px;
    align-items: center;

    text-align: center;

    padding: 0 var(--spacing-quad);

    div {
      margin: var(--spacing) 0;
    }

    .octicon {
      width: 16px;
      height: 16px;
    }

    button {
      flex-grow: 0;
    }
  }

  .callout:not(:last-child) {
    border-right: var(--base-border);
  }
}

#blank-slate {
  display: flex;
  justify-content: center;

  .header {
    max-width: 400px;
    align-self: center;

    text-align: center;

    .title {
      font-size: var(--font-size-lg);
      font-weight: var(--font-weight-semibold);
    }
  }

  .content,
  .footer {
    display: flex;
    flex-direction: row;
    align-self: center;
  }

  .content {
    margin: var(--spacing-quad) var(--spacing-double);
  }

  .callout {
    display: flex;
    flex-direction: column;

    max-width: 370px;
    align-items: center;

    text-align: center;

    padding: 0 var(--spacing-quad);

    div {
      margin: var(--spacing) 0;
    }

    .octicon {
      width: 16px;
      height: 16px;
    }

    button {
      flex-grow: 0;
    }
  }

  .callout:not(:last-child) {
    border-right: var(--base-border);
  }
}

Increase font size and spacing around content
Increase font size and spacing around content
