How do I center this code block?

Here's my site, I'm trying to center the IDX search: 

buyandsellhoover.com

password: peddi

You can remove right column....

or add this code to Home > Design > Custom CSS

div#block-yui_3_17_2_1_1579140351244_7781 + .row .span-1 {
    display: none;
}
div#block-yui_3_17_2_1_1579140351244_7781 + .row {
    display: flex;
    justify-content: center;
}

Thank you! That worked.