diff --git a/README.md b/README.md
index 4f5d4a84a..ef55f3fa8 100644
--- a/README.md
+++ b/README.md
@@ -245,17 +245,20 @@ For 4-column grid it should be:
 
 and so on.
 
-Better yet, here is a SASS code snippet which can make life much easier (Thanks to @ascendantofrain, [#81](https://github.com/gridstack/gridstack.js/issues/81) and @StefanM98, [#868](https://github.com/gridstack/gridstack.js/issues/868)) and you can use sites like [sassmeister.com](https://www.sassmeister.com/) to generate the CSS for you instead:
+Better yet, here is a SASS code snippet, you can use sites like [sassmeister.com](https://www.sassmeister.com/) to generate the CSS for you instead:
 
 ```sass
-.grid-stack > .grid-stack-item {
-  $gridstack-columns: 12;
+$columns: 12;
+@function fixed($float) {
+  @return calc(round($float * 1000) / 1000);
+}
+.grid-stack-#{$columns} > .grid-stack-item {
 
-  min-width: calc(100% / $gridstack-columns);
+  min-width: fixed(calc(100% / $columns));
 
-  @for $i from 0 through $gridstack-columns {
-    &[gs-w='#{$i}'] { width: (calc(100% / $gridstack-columns)) * $i; }
-    &[gs-x='#{$i}'] { left: (calc(100% / $gridstack-columns)) * $i; }
+  @for $i from 1 through $columns - 1 {
+    &[gs-x='#{$i}'] { left: fixed(calc(100% / $columns) * $i); }
+    &[gs-w='#{$i+1}'] { width: fixed(calc(100% / $columns) * ($i+1)); }
   }
 }
 ```
@@ -445,11 +448,12 @@ New addition, no API breakage per say. See release notes about creating sub-grid
 
 ## Migrating to v8
 
-Possible breaking change if you use nested grid JSON format, or original Angular wrapper. Also target is now ES2020 (see release notes).
+Possible breaking change if you use nested grid JSON format, or original Angular wrapper, or relied on specific CSS paths. Also target is now ES2020 (see release notes).
 * `GridStackOptions.subGrid` -> `GridStackOptions.subGridOpts` rename
 * We now have `GridStackWidget.subGridOpts` vs `GridStackNode.subGrid` (was `subGrid` with both types which is error prone)
 * `GridStackOptions.addRemoveCB` -> `GridStack.addRemoveCB` is now global instead of grid option
 * removed `GridStackOptions.dragInOptions` since `setupDragIn()`has it replaced since 4.0
+* remove `GridStackOptions.minWidth` obsolete since 5.1, use `oneColumnSize` instead
 
 # jQuery Application
 
diff --git a/demo/demo.css b/demo/demo.css
index bbb5c1884..66f47a3e1 100644
--- a/demo/demo.css
+++ b/demo/demo.css
@@ -44,21 +44,18 @@ h1 {
   background: rgba(0, 255, 0, 0.1);
   padding: 25px 0;
   height: 100px;
-  text-align: center;
 }
 .sidebar .grid-stack-item {
+  display: inline-block;
+  position: relative;
   width: 120px;
   height: 50px;
-  border: 2px dashed green;
   text-align: center;
   line-height: 35px;
-  z-index: 10;
-  background: rgba(0, 255, 0, 0.1);
-  cursor: default;
-  display: inline-block;
 }
 .sidebar .grid-stack-item .grid-stack-item-content {
-  background: none;
+  width: 100%;
+  height: 100%;
 }
 
 /* make nested grid have slightly darker bg take almost all space (need some to tell them apart) so items inside can have similar to external size+margin */
diff --git a/doc/CHANGES.md b/doc/CHANGES.md
index 89cfaf77d..1c3886696 100644
--- a/doc/CHANGES.md
+++ b/doc/CHANGES.md
@@ -84,6 +84,10 @@ Change log
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
+## 8.0.2 TBD
+* break: remove `GridStackOptions.minWidth` obsolete since 5.1, use `oneColumnSize` instead
+* optimize: CSS files now even 25% smaller (after being halfed in 8.0.0) by removing `.grid-stack` prefix for anything already gs based, and 3 digit rounding.
+
 ## 8.0.1 (2023-04-29)
 * feat: [#2275](https://github.com/gridstack/gridstack.js/issues/2275) `setupDragIn()` now can take an array or elements (in addition to selector string) and optional parent root (for shadow DOM support)
 * fix: [#2234](https://github.com/gridstack/gridstack.js/issues/2234) `Utils.getElements('1')` (called by removeWidget() and others) now checks for digit 'selector' (becomes an id).
diff --git a/src/gridstack-extra.scss b/src/gridstack-extra.scss
index d663d2055..52f5f6d84 100644
--- a/src/gridstack-extra.scss
+++ b/src/gridstack-extra.scss
@@ -2,21 +2,22 @@
  * default to generate [2-11] columns as 1 (oneColumnMode) and 12 (default) are in the main css
  * Copyright (c) 2021 Alain Dumesny - see GridStack root license
  */
-
-@use "sass:math";
-
 $gridstack-columns-start: 2 !default;
 $gridstack-columns: 11 !default;
 
+@function fixed($float) {
+  @return calc(round($float * 1000) / 1000);
+}
+
 @mixin grid-stack-items($columns) {
-  .grid-stack.grid-stack-#{$columns} {
+  .grid-stack-#{$columns} {
 
     > .grid-stack-item {
-      min-width: math.div(100%, $columns);
+      min-width: fixed(calc(100% / $columns));
 
-      @for $i from 1 through $columns {
-        &[gs-w='#{$i}'] { width: math.div(100%, $columns) * $i; }
-        &[gs-x='#{$i}'] { left: math.div(100%, $columns) * $i; }
+      @for $i from 1 through $columns - 1 {
+        &[gs-x='#{$i}'] { left: fixed(calc(100% / $columns) * $i); }
+        &[gs-w='#{$i+1}'] { width: fixed(calc(100% / $columns) * ($i+1)); }
       }
     }
   }
diff --git a/src/gridstack.scss b/src/gridstack.scss
index c3ac946a5..74a6f20f6 100644
--- a/src/gridstack.scss
+++ b/src/gridstack.scss
@@ -3,137 +3,144 @@
  * Copyright (c) 2021 Alain Dumesny - see GridStack root license
  */
 
-@use "sass:math";
-
-$gridstack-columns: 12 !default;
+$columns: 12 !default;
 $animation_speed: .3s !default;
 
+@function fixed($float) {
+  @return calc(round($float * 1000) / 1000);
+}
+
 @mixin vendor($property, $value...){
-  -webkit-#{$property}: $value;
-  -moz-#{$property}: $value;
-  -ms-#{$property}: $value;
-  -o-#{$property}: $value;
+  // -webkit-#{$property}: $value;
+  // -moz-#{$property}: $value;
+  // -ms-#{$property}: $value;
+  // -o-#{$property}: $value;
   #{$property}: $value;
 }
 
-:root .grid-stack-item > .ui-resizable-handle { filter: none; }
-
 .grid-stack {
   position: relative;
+}
 
-  &.grid-stack-rtl {
-    direction: ltr;
-    > .grid-stack-item {
-      direction: rtl;
-    }
+.grid-stack-rtl {
+  direction: ltr;
+  > .grid-stack-item {
+    direction: rtl;
   }
+}
 
-  .grid-stack-placeholder > .placeholder-content {
-    background-color: rgba(0,0,0,0.1);
-    margin: 0;
-    position: absolute;
-    width: auto;
-    z-index: 0 !important;
-    text-align: center;
-  }
+.grid-stack-placeholder > .placeholder-content {
+  background-color: rgba(0,0,0,0.1);
+  margin: 0;
+  position: absolute;
+  width: auto;
+  z-index: 0 !important;
+}
 
-  > .grid-stack-item {
-    min-width: math.div(100%, $gridstack-columns);
-    position: absolute;
-    padding: 0;
+.grid-stack-item-content {
+  margin: 0;
+  position: absolute;
+  width: auto;
+  overflow-x: hidden;
+  overflow-y: auto;
+}
 
-    > .grid-stack-item-content {
-      margin: 0;
-      position: absolute;
-      width: auto;
-      overflow-x: hidden;
-      overflow-y: auto;
-    }
+.grid-stack-item {
+  position: absolute;
+  padding: 0;
 
-    > .ui-resizable-handle {
-      position: absolute;
-      font-size: 0.1px;
-      display: block;
-      -ms-touch-action: none;
-      touch-action: none;
-    }
+  > .ui-resizable-handle {
+    position: absolute;
+    font-size: 0.1px;
+    display: block;
+    -ms-touch-action: none;
+    touch-action: none;
+  }
 
-    &.ui-resizable-disabled > .ui-resizable-handle,
-    &.ui-resizable-autohide > .ui-resizable-handle { display: none; }
+  &.ui-resizable-disabled > .ui-resizable-handle,
+  &.ui-resizable-autohide > .ui-resizable-handle { display: none; }
 
-    > .ui-resizable-ne,
-    > .ui-resizable-nw,
-    > .ui-resizable-se,
-    > .ui-resizable-sw {
-      background-image: url(data:image/svg+xml;base64,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);
-      background-repeat: no-repeat;
-      background-position: center;
-    }
+  > .ui-resizable-ne,
+  > .ui-resizable-nw,
+  > .ui-resizable-se,
+  > .ui-resizable-sw {
+    background-image: url(data:image/svg+xml;base64,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);
+    background-repeat: no-repeat;
+    background-position: center;
+  }
 
-    > .ui-resizable-ne {
-      @include vendor(transform, translate(0, 10px) rotate(45deg));
-    }
-    > .ui-resizable-sw {
-      @include vendor(transform, rotate(45deg));
-    }
+  > .ui-resizable-ne {
+    @include vendor(transform, translate(0, 10px) rotate(45deg));
+  }
+  > .ui-resizable-sw {
+    @include vendor(transform, rotate(45deg));
+  }
 
-    > .ui-resizable-nw {
-      @include vendor(transform, translate(0, 10px) rotate(-45deg));
-    }
-    > .ui-resizable-se {
-      @include vendor(transform, rotate(-45deg));
-    }
+  > .ui-resizable-nw {
+    @include vendor(transform, translate(0, 10px) rotate(-45deg));
+  }
+  > .ui-resizable-se {
+    @include vendor(transform, rotate(-45deg));
+  }
 
-    > .ui-resizable-nw { cursor: nw-resize; width: 20px; height: 20px; top: 0; }
-    > .ui-resizable-n  { cursor: n-resize;  height: 10px; top: 0; left: 25px; right: 25px; }
-    > .ui-resizable-ne { cursor: ne-resize; width: 20px; height: 20px; top: 0; }
-    > .ui-resizable-e  { cursor: e-resize;  width: 10px; top: 15px; bottom: 15px; }
-    > .ui-resizable-se { cursor: se-resize; width: 20px; height: 20px;}
-    > .ui-resizable-s  { cursor: s-resize;  height: 10px; left: 25px; bottom: 0; right: 25px; }
-    > .ui-resizable-sw { cursor: sw-resize; width: 20px; height: 20px;}
-    > .ui-resizable-w  { cursor: w-resize;  width: 10px; top: 15px; bottom: 15px; }
-
-    &.ui-draggable-dragging {
-      &> .ui-resizable-handle {
-        display: none !important;
-      }
+  > .ui-resizable-nw { cursor: nw-resize; width: 20px; height: 20px; top: 0; }
+  > .ui-resizable-n  { cursor: n-resize;  height: 10px; top: 0; left: 25px; right: 25px; }
+  > .ui-resizable-ne { cursor: ne-resize; width: 20px; height: 20px; top: 0; }
+  > .ui-resizable-e  { cursor: e-resize;  width: 10px; top: 15px; bottom: 15px; }
+  > .ui-resizable-se { cursor: se-resize; width: 20px; height: 20px;}
+  > .ui-resizable-s  { cursor: s-resize;  height: 10px; left: 25px; bottom: 0; right: 25px; }
+  > .ui-resizable-sw { cursor: sw-resize; width: 20px; height: 20px;}
+  > .ui-resizable-w  { cursor: w-resize;  width: 10px; top: 15px; bottom: 15px; }
+
+  &.ui-draggable-dragging {
+    &> .ui-resizable-handle {
+      display: none !important;
     }
+  }
+
+  &.ui-draggable-dragging,
+  &.ui-resizable-resizing {
+    z-index: 100;
 
-    @for $i from 0 through ($gridstack-columns - 1) {
-      &[gs-x='#{$i}'] { left: math.div(100%, $gridstack-columns) * $i; }
-      &[gs-w='#{$i + 1}'] { width: math.div(100%, $gridstack-columns) * ($i + 1); }
+    > .grid-stack-item-content {
+      box-shadow: 1px 4px 6px rgba(0, 0, 0, 0.2);
+      opacity: 0.8;
     }
   }
 
-  &.grid-stack-1>.grid-stack-item {
-    min-width: 100%;
+  &.ui-draggable-dragging {
+    will-change: left, top;
+    cursor: move;
   }
 
-  &.grid-stack-animate,
-  &.grid-stack-animate .grid-stack-item {
-    @include vendor(transition, left $animation_speed, top $animation_speed, height $animation_speed, width $animation_speed);
+  &.ui-resizable-resizing {
+    will-change: width, height;
   }
+}
 
-  &.grid-stack-animate .grid-stack-item.ui-draggable-dragging,
-  &.grid-stack-animate .grid-stack-item.ui-resizable-resizing,
-  &.grid-stack-animate .grid-stack-item.grid-stack-placeholder{
-    @include vendor(transition, left 0s, top 0s, height 0s, width 0s);
-  }
+.grid-stack-animate,
+.grid-stack-animate .grid-stack-item {
+  @include vendor(transition, left $animation_speed, top $animation_speed, height $animation_speed, width $animation_speed);
 }
 
-.ui-draggable-dragging,
-.ui-resizable-resizing {
-  z-index: 100;
+.grid-stack-animate .grid-stack-item.ui-draggable-dragging,
+.grid-stack-animate .grid-stack-item.ui-resizable-resizing,
+.grid-stack-animate .grid-stack-item.grid-stack-placeholder{
+  @include vendor(transition, left 0s, top 0s, height 0s, width 0s);
+}
+
+.grid-stack-item[gs-x="0"] {
+  left: 0%;
+}
 
-  > .grid-stack-item-content {
-    box-shadow: 1px 4px 6px rgba(0, 0, 0, 0.2);
-    opacity: 0.8;
+.grid-stack-#{$columns} > .grid-stack-item {
+  min-width: fixed(calc(100% / $columns));
+  @for $i from 1 through ($columns - 1) {
+    &[gs-x='#{$i}'] { left: fixed(calc(100% / $columns) * $i); }
+    &[gs-w='#{$i + 1}'] { width: fixed(calc(100% / $columns) * ($i + 1)); }
   }
 }
-.ui-draggable-dragging {
-  will-change: left, top;
-  cursor: move;
+
+.grid-stack-1 > .grid-stack-item {
+  min-width: 100%;
 }
-.ui-resizable-resizing {
-  will-change: width, height;
-}
\ No newline at end of file
diff --git a/src/gridstack.ts b/src/gridstack.ts
index f51e11d35..e087cf022 100644
--- a/src/gridstack.ts
+++ b/src/gridstack.ts
@@ -270,13 +270,6 @@ export class GridStack {
     if (opts.column === 'auto') {
       delete opts.column;
     }
-    // 'minWidth' legacy support in 5.1
-    /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
-    let anyOpts = opts as any;
-    if (anyOpts.minWidth !== undefined) {
-      opts.oneColumnSize = opts.oneColumnSize || anyOpts.minWidth;
-      delete anyOpts.minWidth;
-    }
     // save original setting so we can restore on save
     if (opts.alwaysShowResizeHandle !== undefined) {
       (opts as InternalGridStackOptions)._alwaysShowResizeHandle = opts.alwaysShowResizeHandle;
@@ -386,9 +379,7 @@ export class GridStack {
     this.setAnimation(this.opts.animate);
 
     this._updateStyles();
-    if (this.opts.column != 12) {
-      this.el.classList.add('grid-stack-' + this.opts.column);
-    }
+    this.el.classList.add('grid-stack-' + this.opts.column);
 
     // dynamic grids require pausing during drag to detect over to nest vs push
     if (this.opts.subGridDynamic && !DDManager.pauseDrag) DDManager.pauseDrag = true;