Cannot remove top and bottom margin on the H1 of my webpage [closed]

I am new to HTML and CSS.

I am trying to remove the top and bottom margin from my H1 but the default margin remains.

My CSS so far looks like the below:

    font-family: 'Cormorant Garamond';    font-size: 65px;    letter-spacing: 40px;    color: white;    text-align: center;

I have also added tried each of the following:

    margin: none;    margin-top: none;    margin-top: 0px;    margin-top: 0%;    margin: 0;  

The default margins remain.

Does anyone have any ideas why this could be?