Make the tabs float on top of the page like the header bar

[MonikaFu]

Currently they disappear when user scrolls down on a page.

Top:

After scrolling down:

AB#12279

[MonikaFu]

Maybe we could also consider the asset class and sector selectors and exposure stats to float on top?

[jdhoffa]

Adding something like this to the app.postcss seems to do the trick here more or less:

.tab-list {
	position: fixed;
	background-color: rgb(var(--color-surface-100));
}