Just edit the CSS file:

.cs-btn-print, .cs-btn-nprint {
  background-color: #0071bd;
  color: white;
  width: 100%;
  min-height: 80px;
  font-size: 1.5rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center; 
  justify-content: center;
}