.banner {
  width: 100%;
}
#form {
  background: url(https://sitefile.keshun.com.cn/keshunWeb2022/mobile/images/resolution/JZGZ/banner2.jpg) no-repeat center top;
  background-size: cover;
  padding: 2rem 3rem;
}
#form .form-item {
  width: 100%;
  position: relative;
}
#form .form-item:nth-child(n+2) {
  margin-top: 0.75rem;
}
#form .form-item input {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  border: 0;
  background-color: transparent;
  width: 65%;
  height: 64%;
  font-size: 1rem;
}
#form .form-item textarea {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 5%;
  width: 95%;
  height: 60%;
  border: 0;
  background-color: transparent;
  font-size: 1rem;
}
#form .tip {
  margin-top: 0.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: #fff;
}
#form .img-btn {
  margin: 0.5rem auto 0;
  width: 13.4375rem;
}
@media (min-width: 768px) {
  #form .img-btn {
    zoom: 1.5;
  }
}