How to visualize the weights of the output(classification) layer?

I'm doing a Convolutional Neural Network of MNIST data set, and how can I visualize the weights of the output(classification) layer? I only found several websites visualizing the filters in CNN model but none for the output layer.

this is my code so far:

model = Sequential()
input_shape=(28,28,1),
filters=16,kernel_size= (5,5),
activation='relu'))
filters=16,kernel_size= (3,3),
activation='relu'))