diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index fab545d09b8..07c6468a4b1 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -1461,6 +1461,12 @@
 .openerp .oe_form .oe_form_field_datetime input {
   min-width: 11em;
 }
+.openerp .oe_form .oe_form_field_many2manytags .text-wrap {
+  width: 100% !important;
+}
+.openerp .oe_form .oe_form_field_many2manytags .text-wrap textarea {
+  width: 100% !important;
+}
 .openerp .oe_form .oe_datepicker_container {
   display: none;
 }
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index 447bfc48abf..5e43a411ef9 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -1211,6 +1211,10 @@ $colour4: #8a89ba
             padding-top: 4px
         .oe_form_field_datetime input
             min-width: 11em
+        .oe_form_field_many2manytags .text-wrap
+            width: 100% !important
+            textarea
+                width: 100% !important
         .oe_datepicker_container
             display: none
         .oe_datepicker_root
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index b48789f6e0f..e0ae9adf9e2 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -1040,7 +1040,7 @@
     </t>
 </t>
 <t t-name="FieldMany2ManyTags">
-    <div class="oe_form_field_many2many">
+    <div class="oe_form_field_many2manytags">
         <textarea rows="1" style="width: 100%"></textarea>
     </div>
 </t>