message: Fix button sizes in modern theme according to design
diff: .sv-btn {
  border: none;
  - border-radius: 1.06em;
  + border-radius: 1.214em;
  color: #ffffff;
  cursor: pointer;
  font-family: Segoe UI;
  - font-size: 1em;
  + font-size: 0.875em;
  font-weight: bold;
  outline: none;
  - padding: 0.39em 0.87em 0.48em;
  + padding: 0.5em 2.786em 0.6em;
  text-align: left;
  }
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