.header.product-head{
  padding: 0 0 16px;
}

.product-head .poster{
  width: 100%;
  height: 320px;
  background: #FFFFFF;
  transition: all 0.3s;
  text-align: center;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.bg-img {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  line-height: 0;
  background-position: center;
  bottom: 0;
  background-size: cover;
}

.fixed.buy{
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
}

.buy .btn{
  height: 56px;
  width: 100%;
  background: #20C969;
  display: inline-block;
  color: #fff;
  text-align: center;
  line-height: 56px;
  font-size: 20px;
  text-decoration: none;
}

.product-desc{
  color: #444;
  line-height: 1.5;
}

.footer{
  padding-bottom: 64px;
}