diff --git a/addons/web/static/src/core/dialog/dialog.xml b/addons/web/static/src/core/dialog/dialog.xml
index 12f6b05c5df..ae8bead3d41 100644
--- a/addons/web/static/src/core/dialog/dialog.xml
+++ b/addons/web/static/src/core/dialog/dialog.xml
@@ -8,7 +8,7 @@
                 t-att-class="{ o_technical_modal: props.technical, o_modal_full: isFullscreen }"
                 t-ref="modalRef"
                 >
-                <div class="modal-dialog" t-attf-class="modal-{{props.size}}">
+                <div class="modal-dialog modal-dialog-centered" t-attf-class="modal-{{props.size}}">
                     <div class="modal-content" t-att-class="props.contentClass" t-att-style="contentStyle">
                         <header t-if="props.header" class="modal-header">
                             <t t-slot="header" close="data.close" isFullscreen="isFullscreen">
diff --git a/addons/web/static/src/core/errors/error_dialog.scss b/addons/web/static/src/core/errors/error_dialog.scss
index cf5bfb1d6bd..b0ce72c496f 100644
--- a/addons/web/static/src/core/errors/error_dialog.scss
+++ b/addons/web/static/src/core/errors/error_dialog.scss
@@ -1,7 +1,4 @@
 .o_error_dialog {
-    top: 50%;
-    transform: translateY(-50%);
-
     @include media-breakpoint-up(md) {
         padding: 1rem;