Aleram You can use this code to fix the position of the leaderboard!
On the basis of @[deleted] ’s code, I simplified the css code to correct the position of the leaderboard. put it in the flarum console "Custom css".
/ * Voting ranking Location optimization * /
.RankingPage.sideNavOffset {/ * the outermost div * /
    width: 600px;
    margin-left: 30px;
    float: left;
}
.rankings {/ * Table title alignment * /
    margin-top: 20px;
}
tr .rankings-mobile {/ * trophy cell * /
    width: 150px;
}
.rankings-loadmore button {/ * More buttons Location * /
    display: flex;
    margin: 0 auto;
}
.TagsPage .sideNav {/ * left column div * /
    float: left! important;
    white-space: inherit! important;
}
.sideNav .Dropdown--select .Dropdown-menu {/ * column * /
    margin-top: 20px! important;
}
@media (min-width: 992px) {
    .TagsPage .sideNav> ul> li, .TagsPage .sideNav .Dropdown-menu> li {
    display: inherit! important; / * Force the column labels to restore the original arrangement * /
    }
    .Dropdown-separator {
    margin: 8px 0! important; / * Force the original space between the announcement and the tag to be restored * /
    }
    .sideNav> ul> li {
    margin-bottom: 10px! important; / * Force the online user to restore the original space between the sandbox * /
    }
}
