Grinch-AP/WebHost/static/static.css

table.dataTable.table-sm > thead > tr > th :not(.sorting_disabled) {
    padding: 1px;
}

.dataTable > thead > tr > th[class*="sort"]:before,
.dataTable > thead > tr > th[class*="sort"]:after {
    content: "" !important;
}

th {
    padding: 1px !important;
}