.footer {
  width: 100%;
  position: fixed;
  bottom: 0;
  background: #fff;
  border-top: 1px solid #ddd;
  display: table;
  z-index: 9;
  max-width: 414px;  margin: 0 auto; 
}

.footer ul {
  display: table-row;
}

.footer li {
  display: table-cell;
  text-align: center;
}

.footer li a {
  height: 49px;
  line-height: 49px;
  display: block;
  font-size: 14px;
  color: #a0a0a0;
}

.footer li a.active {
  color: #ff730b;
}

.footer li a i {
  width: 17px;
  height: 17px;
  display: inline-block;
  background: url(../images/column.png) no-repeat;
  background-size: cover;
  position: relative;
  top: 4px;
  margin-right: 6px;
}

.footer li a i.icon-book {
  background-position: 0 0;
}

.footer li a.active i.icon-book {
  background-position: -20px 0;
}

.footer li a i.icon-choice {
  background-position: -42px 0;
}

.footer li a.active i.icon-choice {
  background-position: -61px 0;
}

.footer li a i.icon-my {
  background-position: -80px 0;
}

.footer li a.active i.icon-my {
  background-position: -98px 0;
}