Bootstrap 3 modal creates scrollbar when opened

Question

I\'m trying to use Bootstrap for the first time and am having an issue with modal dialogs. Using the example code on this page, when the modal is opened a scrollbar appears,

Answer 1

In my case there were my own styles that caused the problem:

html {
    overflow-y: scroll;
}

You may change html to body so there is only one scrollbar:

body {
    overflow-y: scroll;
}