This is what my achievements on all SE sites look like on Firefox 49.0.2 and Chrome 54.0.2840.99 m (64-bit):

enter image description here

But this is what it looks like on Microsoft Edge 38.14393.0.0:

enter image description here

If I recall correctly, the latter picture is how it used to be in all browsers.

It seems like the width of .achievements-dialog .message-text is too big:

.achievements-dialog .message-text {
    margin-left: 2px;
    width: 276px;

Is this a or ?

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