yii - Force Twitter Bootstrap 3 modal to not hide vertical scrollbar -


vertical scrollbar being hidden, when twitter bootstrap 3 modal appears, , returns, when modal hidden. since elements on page varies position on whether vertical scrollbar or isn't visible -- produces overall not looking effect:

enter image description here

is there way prevent , force vertical scrollbar stay on screen time, during displaying of twitter bootstrap 3 modal?

i'm using modals generated yii2 framework, doubt, framework issue. seems more core twitter bootstrap 3 problem.

in custom css file should loaded after bootstrap css add following code:

.modal-open {     overflow: scroll; }

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