So this is a container shadow that you don't want? If so, you can change the .dropdown-menu css class by adding something like
.dropdown-menu { border: none; border-radius: 0; -webkit-box-shadow: none; box-shadow: none; }
If this does not work, add !important before ; in properties that do not fade, for example:
.dropdown-menu { border: none !important; }
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