How to remove the standard button loading on the custom VF page

Method 1 - Add below CSS class:

        input.btn[name="edit"] {  // removes the Edit button

            display: none;

        }

        input.btn[name="convert"] { // removes the convert button

            display: none;

        }

        input.btn[name="del"] {

            display: none;

        }

        input.btn[name="clone"] {

            display: none;

        }       

        input.btn[name="dupes"] {

            display: none;

        }

Method 2 - Add below JS function:

        window.onload = function toggleButtons() {

            window.document.getElementsByName('offline')[0].style.display = 'none';

        }