justify-content: center not working in IE?

Question

css

napalme.maxnrg.ru Justify
-content: center doesn't work in IE.
In the second section in the block - "Welcome"
css code

display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;

Answer 1

caniuse.com/#search=flex
as you can see in IE11 is yellow, which means that the support is not complete