Mám tlačítko
<input class="input2" type="submit" value="ODESLAT">

a css

input2 {
  background: #3498db;
  background-image: -webkit-linear-gradient(top, #3498db, #2980b9);
  background-image: -moz-linear-gradient(top, #3498db, #2980b9);
  background-image: -ms-linear-gradient(top, #3498db, #2980b9);
  background-image: -o-linear-gradient(top, #3498db, #2980b9);
  background-image: linear-gradient(to bottom, #3498db, #2980b9);
  -webkit-border-radius: 5;
  -moz-border-radius: 5;
  border-radius: 5px;
  font-family: Arial;
  color: #ffffff;
  font-size: 18px;
  padding: 6px 12px 6px 12px;
  text-decoration: none;
}