/* Add custom Js styles below */ 
/* هذا الكود يستهدف الحاوية اللي شفتها في الـ Inspect عندك بالملي */
div.bg_header {
    top: 60px !important;
    position: relative !important;
    margin-top: 60px !important;
    transform: translateY(0px) !important;
}

/* وهذا عشان نتأكد إن الحاوية الكبيرة ما تمنعها */
#mainnav {
    padding-top: 60px !important;
    position: relative !important;
}
<div style="position: relative; width: 100%; height: 0; padding-top: 100.0000%;
 padding-bottom: 0; box-shadow: 0 2px 8px 0 rgba(63,69,81,0.16); margin-top: 1.6em; margin-bottom: 0.9em; overflow: hidden;
 border-radius: 8px; will-change: transform;">
  <iframe loading="lazy" style="position: absolute; width: 100%; height: 100%; top: 0; left: 0; border: none; padding: 0;margin: 0;"
    src="https://www.canva.com/design/DAHGmigWHC4/2PVLqDbYetB19KPMbeJcWg/view?embed" allowfullscreen="allowfullscreen" allow="fullscreen">
  </iframe>
</div>
<a href="https:&#x2F;&#x2F;www.canva.com&#x2F;design&#x2F;DAHGmigWHC4&#x2F;2PVLqDbYetB19KPMbeJcWg&#x2F;view?utm_content=DAHGmigWHC4&amp;utm_campaign=designshare&amp;utm_medium=embeds&amp;utm_source=link" target="_blank" rel="noopener">ERSA</a> بواسطة mydoo82021