CSS hide scroll bar if not needed

.selected-elementClass{
    overflow-y:auto;
}

You can use overflow:auto;

You can also control the x or y axis individually with the overflow-x and overflow-y properties.

Example:

.content {overflow:auto;}
.content {overflow-y:auto;}
.content {overflow-x:auto;}

Set overflow-y property to auto, or remove the property altogether if it is not inherited.

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