remove padding-right and padding-left from .main class

src/client/styles/scss/_layout.scss

@@ -29,8 +29,6 @@ body {
 }
 
 .main {
-  padding-right: 15px;
-  padding-left: 15px;
   margin-top: 1rem;
 }
 

src/client/styles/scss/_on-edit.scss

@@ -45,13 +45,6 @@ body.on-edit {
     @include expand-editor($editor-margin-top);
   }
 
-  // for growi layout
-  .main {
-    .col.grw-page-content-container {
-      padding: 0;
-    }
-  }
-
   // show
   .d-edit-block {
     display: block !important;