main{max-width:1200px;margin:0 auto;}main iframe{width:100%;height:4550px;}main .form-nav{display:flex;align-items:center;justify-content:space-between;max-width:640px;height:78px;margin:20px auto 0;}@media (max-width:996px){main .form-nav{padding:0 15px 0 20px;}}