Working on undo redo capabilities

src/assets/main.css

@@ -8,6 +8,7 @@
     --datagrid-resize-zindex: 1;
     --color-splitter: color-mix(in oklab, var(--color-base-content) 50%, #0000);
     --color-splitter-active: color-mix(in oklab, var(--color-base-content) 50%, #ffff);
+    --color-btn-hover: color-mix(in oklab, var(--btn-color, var(--color-base-200)), #000 7%);
 }
 
 .mmt-tooltip-container {
@@ -36,6 +37,19 @@
     transition: opacity 0.2s ease, visibility 0s linear 0.2s;
 }
 
+.mmt-btn {
+    user-select: none;
+    border-style: solid;
+}
+
+.mmt-btn:hover {
+    background-color: var(--color-btn-hover);
+}
+
+.mmt-btn-disabled {
+    opacity: 0.5;
+    /*cursor: not-allowed;*/
+}
 
 /* When parent is hovered, show the child elements with this class */
 *:hover > .mmt-visible-on-hover {
@@ -63,6 +77,8 @@
     width: 24px;
     min-width: 24px;
     height: 24px;
+    margin-top: auto;
+    margin-bottom: auto;
 }
 
 .icon-24 svg {