.sv-btn {
  border: none;
  border-radius: 1.214em;
  color: #ffffff;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875em;
  font-weight: bold;
  outline: none;
  padding: 0.5em 2.786em 0.6em;
  text-align: left;
}
.sv-btn {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border: none;
  border-radius: 1.214em;
  color: #ffffff;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875em;
  font-weight: bold;
  outline: none;
  padding: 0.5em 2.786em 0.6em;
  text-align: left;
}

Fix button appearance in modern theme (Safari bug)
Fix button appearance in modern theme (Safari bug)
