Technique # 4 css.css

.btn-yellow {
  background: rgb(250, 255, 140);
  color: #574500;
  border: none;
  -moz-box-shadow: none !important;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
 /* !important tags aren't necessarily always bad */
}
.btn-yellow:hover, .btn-yellow:focus {
  background: rgb(252, 255, 179);
}
.btn-yellow:active {
  background: rgb(247, 255, 71);
}