Please complete the following steps:
1) Go to the plugin settings page and open "Custom Code" tab;
2) Find "CSS" section, mark the "Activate custom CSS code" checkbox and insert the following code:
#cntctfrm_contact_form textarea { border: 1px solid #CCCCCC !important;
}
3) Save changes.
This article related to Contact Form by BestWebSoft plugin
Additional resources: Contact Form - User Guide
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