.introbox .l .book .bookinfo{
  padding: 2%;
}
.downtip{
  border-top: 3px solid #e9edfa;
}
.downtip p{
  font-size: 16px;
  color: #5e7ce0;
  padding: 2%;
  font-weight: 700;
}
.downs{
  padding: 2%;
}
.downs form{
  display: flex ;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
}
.downs form input{
  font-size: 18px;
  width: 20%;
  height: 38px;
  padding: 2%;
}
.downs form img{
  cursor: pointer;
  height: 38px;
}
.downs form button{
  display: inline-block;
    width: 100px;
    height: 38px;
    background: #5e7ce0;
    color: #ffffff;
    line-height: 36px;
    font-size: 16px;
    margin: 0 2%;
    cursor: pointer;
    text-align: center;
    border-radius: 2px;
    box-shadow: none;
    border: none;
}
.downs form button:hover{
    background: #35498b;
}
@media screen and (max-width: 768px) {
  .downs form input{
    width: 30%;
 
  }
}