minor: Fixed hidden closing button of Sidebar

[Zopsss]

Fixed closing button of the sidebar.

Before:

After:

Changed CSS from top-0 to top-[64px]... WHY 64PX??

Explanation:

In tailwind.config.js, we have defined height of the sidebar as 100vh-64px:

cms/tailwind.config.js

Lines 87 to 89 in 204c496

	height: {
	sidebar: 'calc(100vh - 64px)',
	},

Similarly in tailwind.css:

cms/src/styles/tailwind.css

Lines 1053 to 1055 in 204c496

	.h-sidebar {
	height: calc(100vh - 64px);
	}

But the sidebar had inline TailwindCSS in which we defined top-0 so it was sticking to the top and was getting covered by navbar.

[Zopsss]

@devsargam please review once you get some free time

[hkirat]

@devsargam