.embed-container{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%}.embed-container embed,.embed-container iframe,.embed-container object{position:absolute;top:0;left:0;width:100%;height:100%}.loader{border:5px solid #f3f3f3;border-top:5px solid #3498db;border-radius:50%;width:30px;height:30px;animation:spin 1s linear infinite;display:none;margin:10px auto}button{background-color:#3498db;color:#fff;border:none;padding:10px 20px;border-radius:4px;cursor:pointer;font-size:16px}button:hover{background-color:#2980b9}textarea{width:100%;height:100px;margin-bottom:10px}@-moz-keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}@-webkit-keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}@-o-keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}