Fix range input slider styles in Internet Explorer

[krikienoid]

The experimental Sliders component does not currently render in Internet Explorer. This pull request fixes the style issues in Internet Explorer.

I only had to add three lines of code, here are the details on what the code I added actually does:

.slider {
	// Remove default padding which causes the slider to be clipped out
	// https://stackoverflow.com/a/45665242
	padding: 0;

	&::-ms-track {
		// Remove default black border
		border: 0;

		// Remove default black tickmarks
		// https://stackoverflow.com/a/56599481
		color: transparent;
	}
}