KendoEditor does not display styles

I am using the KendoEditor and when I add table the table doesn't have borders or any style. When I test on your page the table is having (inspect element) this class and style

ProseMirror td, .ProseMirror th {
min-width: 1em;
border: 1px solid #ddd;
padding: 3px 5px;
vertical-align: top;
box-sizing: border-box;
position: relative;

}

But in my case this is missing, there is not a class for td for ProseMirror, and the only style that I get is this

.k-editor-content > .ProseMirror table {
white-space: pre-wrap;
}

Any idea what might be causing this problem ? :)