.banner {
  width: 100%;
}
.banner img {
  width: 100%;
}

.app-list {
  display: flex;
  padding: 25px 20px 0 20px;
}
.app-list a {
  width: 68px;
}
.app-list h3 {
  width: 68px;
  height: 68px;
}
.app-list h3.course {
  background: url("../images/icon-course.png") center no-repeat;
  background-size: 68px 68px;
}
.app-list h3.art {
  background: url("../images/icon-art.png") center no-repeat;
  background-size: 68px 68px;
}

.footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  background: #f7f7f7;
  padding: 20px 0;
  color: #AFAFB0;
}
.footer a {
  color: #2A60FF;
}