[CSS] Fix unwanted top margin for toggle wrapper

[GuillaumeGomez]

Fixes top margin.

Before:

After (check "A view into a single entry in map" toggle wrapper more precisely):

r? @steveklabnik

[steveklabnik]

@bors: r+ rollup

[bors]

📌 Commit 4a2116b has been approved by steveklabnik

[bors]

⌛ Testing commit 4a2116b with merge 78eea9d...

[bors]

💔 Test failed - auto-win-msvc-64-cargotest

[alexcrichton]

@bors: retry

• Cascading failure on bots when interrupted when performing git operations #34595

On Tue, Jul 19, 2016 at 10:09 PM, bors notifications@github.com wrote:

💔 Test failed - auto-win-msvc-64-cargotest
https://buildbot.rust-lang.org/builders/auto-win-msvc-64-cargotest/builds/1174

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[bors]

⌛ Testing commit 4a2116b with merge 29a8ed7...

[bors]

💔 Test failed - auto-linux-64-cargotest

[alexcrichton]

@bors: retry

On Wed, Jul 20, 2016 at 6:33 PM, bors notifications@github.com wrote:

💔 Test failed - auto-linux-64-cargotest
https://buildbot.rust-lang.org/builders/auto-linux-64-cargotest/builds/1204

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