You can increase the size of icons using CSS.
Here is an example:
01: <style>
02: .size-50 {
03: width: 50px;
04: height: 50px;
05: }
06: </style>
07:
08: <i data-feather="log-in" class="size-50"></i>
09:
10: <script src="https://cdn.jsdelivr.net/npm/feather-icons/dist/feather.min.js"></script>
11: <script>
12: feather.replace();
13: </script>
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