fix(fab): remove absolute positioning on close icon

Author: brandyscarney

core/src/components/fab-button/fab-button.scss

@@ -203,11 +203,6 @@
 
 .close-icon {
   @include margin(0, auto);
-  @include position(0, 0, null, 0);
-
-  position: absolute;
-
-  height: 100%;
 
   transform: scale(0.4) rotateZ(-45deg);
 
@@ -217,8 +212,6 @@
   font-size: var(--close-icon-font-size);
 
   opacity: 0;
-
-  z-index: 1;
 }
 
 // FAB Animation