diff --git a/netbox/extras/forms/config.py b/netbox/extras/forms/config.py
index 4a7dba614..0a31e40f6 100644
--- a/netbox/extras/forms/config.py
+++ b/netbox/extras/forms/config.py
@@ -25,6 +25,8 @@ class FormMetaclass(forms.models.ModelFormMetaclass):
             }
             field_kwargs.update(**param.field_kwargs)
             param_fields[param.name] = param.field(**field_kwargs)
+            if param.size:
+                param_fields[param.name].widget.attrs["size"] = param.size
         attrs.update(param_fields)
 
         return super().__new__(mcs, name, bases, attrs)
diff --git a/netbox/netbox/config/parameters.py b/netbox/netbox/config/parameters.py
index b4f16bf28..83fa0f5bc 100644
--- a/netbox/netbox/config/parameters.py
+++ b/netbox/netbox/config/parameters.py
@@ -4,13 +4,14 @@ from django.contrib.postgres.forms import SimpleArrayField
 
 class ConfigParam:
 
-    def __init__(self, name, label, default, description='', field=None, field_kwargs=None):
+    def __init__(self, name, label, default, description='', field=None, field_kwargs=None, size=None):
         self.name = name
         self.label = label
         self.default = default
         self.field = field or forms.CharField
         self.description = description
         self.field_kwargs = field_kwargs or {}
+        self.size = size
 
 
 PARAMS = (
@@ -20,19 +21,22 @@ PARAMS = (
         name='BANNER_LOGIN',
         label='Login banner',
         default='',
-        description="Additional content to display on the login page"
+        description="Additional content to display on the login page",
+        size="80",
     ),
     ConfigParam(
         name='BANNER_TOP',
         label='Top banner',
         default='',
-        description="Additional content to display at the top of every page"
+        description="Additional content to display at the top of every page",
+        size="80",
     ),
     ConfigParam(
         name='BANNER_BOTTOM',
         label='Bottom banner',
         default='',
-        description="Additional content to display at the bottom of every page"
+        description="Additional content to display at the bottom of every page",
+        size="80",
     ),
 
     # IPAM
@@ -77,7 +81,8 @@ PARAMS = (
         ),
         description="Permitted schemes for URLs in user-provided content",
         field=SimpleArrayField,
-        field_kwargs={'base_field': forms.CharField()}
+        field_kwargs={'base_field': forms.CharField()},
+        size="80",
     ),
 
     # Pagination
@@ -157,7 +162,8 @@ PARAMS = (
         name='MAPS_URL',
         label='Maps URL',
         default='https://maps.google.com/?q=',
-        description="Base URL for mapping geographic locations"
+        description="Base URL for mapping geographic locations",
+        size="80",
     ),
 
 )