I'm hardcode to all width for search input but does'nt work

This is code i use

<style>
.dataTables_info,
.dataTables_length {
font-size: 15px;
}

.dataTables_filter input {
    width: 400px;
}

.dataTables_wrapper {
    font-size: 15px;
}

<style>

all css working only .dataTables_filter input not working well