html,
body {
  height: 100%;
  width: 100%;
}

.wrap {
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  height: 50px;
  width: 100px;
}

a {
  margin-top: 5px;
  margin-bottom: 5px;
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 0;
  font-size: 14px;
  font-weight: normal;
  line-height: 1.428571429;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 4px;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  cursor: pointer;
  color: #ffffff;
  text-decoration: none;
  font-weight: bold;
  background-color: #428bca;
  border-color: #357ebd;
  font-family: sans-serif;
  width: 120px;
}