dom.html

<a href="#" class="button h64" id="buy_package_1234">
  <div class="left bg"></div>
  <div class="right bg"></div>
  <span class="text">Buy</span>
</a>

layout2.css

.button {
  display: block;
  position: relative;
  text-decoration: none !important;
}

.button .bg {
  top: 0;
  position: absolute;
  width: 50%;
  height: 100%;
  background-repeat: no-repeat;
  background-color: transparent;
  margin: 0 !important;
  padding: 0 !important;
  display: block !important;
}

.button .left {
  left: 0;
}

.button .right {
  left: 50%;
}

.button .text {
  display: block;
  width: 100%;
  text-align: center;
  color: #e5e5e5;
  position: relative;
  font-weight: bold;
}

.button.disabled .text {
  color: #dfdfdf;
}

.button.h64 {
  height: 64px;
}

.button.h64 .text {
  top: 12px;
  font-size: 30px;
}

.button.h64 .bg {
  background-image: url(buttons-64.png);
}

.button.h64 .left {
  background-position: 0 0;
}

.button.h64 .right {
  background-position: right top;
}

.button.h64:hover .left {
  background-position: 0 -64px;
}

.button.h64:hover .right {
  background-position: right -64px;
}

.button.h64:active .left {
  background-position: 0 -128px;
}

.button.h64:active .right {
  background-position: right -128px;
}

.button.h64.disabled .left {
  background-position: 0 -192px !important;
}

.button.h64.disabled .right {
  background-position: right -192px !important;
}

.button.h56 {
  height: 56px;
}

.button.h56 .text {
  top: 12px;
  font-size: 26px;
}

.button.h56 .bg {
  background-image: url(buttons-56.png);
}

.button.h56 .left {
  background-position: 0 0;
}

.button.h56 .right {
  background-position: right top;
}

.button.h56:hover .left {
  background-position: 0 -56px;
}

.button.h56:hover .right {
  background-position: right -56px;
}

.button.h56:active .left {
  background-position: 0 -112px;
}

.button.h56:active .right {
  background-position: right -112px;
}

.button.h56.disabled .left {
  background-position: 0 -168px !important;
}

.button.h56.disabled .right {
  background-position: right -168px !important;
}

.button.h23 {
  height: 23px;
}

.button.h23 .text {
  top: 3px;
  font-size: 12px;
}

.button.h23 .bg {
  background-image: url(buttons-23.png);
}

.button.h23 .left {
  background-position: 0 0;
}

.button.h23 .right {
  background-position: right top;
}

.button.h23:hover .left {
  background-position: 0 -23px;
}

.button.h23:hover .right {
  background-position: right -23px;
}

.button.h23:active .left {
  background-position: 0 -46px;
}

.button.h23:active .right {
  background-position: right -46px;
}

.button.h23.disabled .left {
  background-position: 0 -69px !important;
}

.button.h23.disabled .right {
  background-position: right -69px !important;
}