.demo {
  position: relative;
  margin: 5% !important;
}
.demo .button {
  display: block;
  float: left;
  margin: 5px;
  width: 130px;
  height: 40px;
    white-space: nowrap;
    text-overflow: ellipsis;
}
.key {
  position: absolute;
  display: block;
  bottom: 2px;
  right: 2px;
  text-decoration: none;
  color: #fff;
  border: 1px solid #fff;
  border-bottom-width: 2px;
  width: 14px;
  padding: 1px 0;
  text-align: center;
  border-radius: 2px;
  font-size: 10px;
}
.key.key_state_active {
  border-width: 1px;
  border-top-width: 2px;
  border-color: #000;
  color: #000;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.8);
}
footer{
color: white;
float: left;
width: 100%;
text-align: center;
}