project/project1/unpackage/dist/dev/mp-weixin/pages/login/login.wxss

.form {
  width: 80%;
  margin: 50rpx auto;
}
.form .btn {
  margin-top: 40rpx;
}
.register {
  color: #00f;
  width: 209rpx;
  margin: 0 auto;
}