@media only screen and (max-width: 768px) {
  /* Shrink the container */
  .theme-menu {
    width: 50% !important;
    margin: 0 auto;
  }

  /* Shrink the actual list of menu items */
  .theme-menu ul[data-zp-menu-top] {
    width: 100% !important; /* use 100% inside the container */
    text-align: left;
  }

  /* Shrink the submenu icon container if visible */
  .theme-sub-li-menu {
    width: 100% !important;
    margin: 0 auto;
  }
}
<iframe aria-label='We're So Glad You Reached Out!' frameborder="0" allow="geolocation;" style="height:1250px;width:100%;border:none;" src='https://forms.zohopublic.com/revolutionarysolutions/form/WereSoGladYouReachedOut/formperma/KRSWlZqKJEzZc8Vf3L63MZv2q_clHs88aJBgareRy4k'></iframe>
<div class="form-wrapper">
@media only screen and (max-width: 768px) {
  /* Force full-width Zoho Form iframe on mobile */
  iframe[src*="zoho.com"] {
    width: 100vw !important;
    max-width: 100vw !important;
    margin: 0 auto;
    display: block;
  }

  /* Override Zoho Sites container width limits */
  .zpelement iframe {
    width: 100vw !important;
    max-width: 100vw !important;
    margin: 0 auto;
    display: block;
  }

  .zpelement {
    padding: 0 !important;
    margin: 0 auto !important;
    width: 100vw !important;
    box-sizing: border-box;
  }
}