.banner img {
    width: 100%;
}
.banner {
    margin-bottom: 20px;
}
.pro {
    margin-bottom: 20px;
    text-align: center;
}
.pro div {
    margin: 0 40px;
    display: inline-block;
    text-align: center;
}
.pro img {
    width: 300px;
}
.pro .link {
  cursor: pointer;  
}
.center {
    margin-bottom: 20px;
    text-align: center;
}
.center img {
    width: 80%;
    text-align: center;
}
.last {
    margin-bottom: 20px;
}
.last img {
    width: 400px;
}