How to make modal overlay scrollable using CSS -

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how make overlay scrollable when modal's length has exceeded current view's height?

my overlay has following css:

.ngdialog-overlay {   position: fixed;   background: rgba(0, 0, 0, 0.4);   top: 0;   right: 0;   bottom: 0;   left: 0;   -webkit-backface-visibility: hidden;   -webkit-animation: ngdialog-fadein 0.5s;   animation: ngdialog-fadein 0.5s; }

if remove top, right, bottom , left properties, can scroll outside modal fine, don't have overlay visible.

most of solutions i've found in use code above (with exception of -webkit , animation), it's not working me.

have tried overflow: auto; on dialog?

.ngdialog-overlay {   position: fixed;   background: rgba(0, 0, 0, 0.4);   top: 0;   right: 0;   bottom: 0;   left: 0;   -webkit-backface-visibility: hidden;   -webkit-animation: ngdialog-fadein 0.5s;   animation: ngdialog-fadein 0.5s;   overflow: auto; }

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