fix(modal): prevent modal from shifting when scrollbar appears (#5119)

Author: emyarod

packages/components/src/components/modal/_modal.scss

@@ -25,13 +25,13 @@
   .#{$prefix}--modal {
     position: fixed;
     top: 0;
-    right: 0;
-    bottom: 0;
     left: 0;
     z-index: z('modal');
     display: flex;
     align-items: center;
     justify-content: center;
+    width: 100vw;
+    height: 100vh;
     content: '';
     background-color: transparent;
     opacity: 0;