style_overrides.css

.d2h-diff-table {
    .d2h-diff-tbody {
        tr {
            td {
                padding: 0;
                margin: 0;
            }
        }
    }
}

.d2h-file-header {
    .d2h-file-collapse {
        .d2h-file-collapse-input {
            margin: 0 4px 0 0;
        }
    }
}