.button-group,
.button-group li{
  display: inline-block;
  display: inline;
  zoom: 1;
}

.button-group{
  font-size: 0; /* Inline block elements gap - fix */
  margin: 0;
  padding: 0;
  background: rgba(0, 0, 0, .04);
  border-bottom: 1px solid rgba(0, 0, 0, .07);
  padding: 7px;
  border-radius: 7px; 
}

.button-group li{
  margin-right: -1px; /* Overlap each right button border */
}

.button-group .button{
  font-size: 13px; /* Set the font size, different from inherited 0 */
  border-radius: 0; 
}

.button-group .button:active{
  box-shadow: 0 0 1px rgba(0, 0, 0, .2) inset,
              5px 0 5px -3px rgba(0, 0, 0, .2) inset,
              -5px 0 5px -3px rgba(0, 0, 0, .2) inset;   
}

.button-group li:first-child .button{
  border-radius: 3px 0 0 3px;
}

.button-group li:first-child .button:active{
  box-shadow: 0 0 1px rgba(0, 0, 0, .2) inset,
              -5px 0 5px -3px rgba(0, 0, 0, .2) inset;
}

.button-group li:last-child .button{
  border-radius: 0 3px 3px 0;
}

.button-group li:last-child .button:active{
  box-shadow: 0 0 1px rgba(0, 0, 0, .2) inset,
              5px 0 5px -3px rgba(0, 0, 0, .2) inset;
}