Menu in tablet view

Hello. I would like to change the width and hight or the menu in the tablet view. So far it looks like it the picture, however I would like to place it a bit in the middle.

Hello there,

Please try adding this CSS cod eto Appearance > Customize > Additional CSS from dashboard.

    @media only screen and (max-width: 991px) {
      .header-slider .col-md-8 {
        margin-top: -90px;

If it doesn’t help, to help me getting the exact code, please share a link to your site here.