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If I understand correctly, you were referring to the font of the Matrix table column instead.
You can style it using custom injected CSS code.
border: 1px solid #e60d00;
color: #e60d00 !important;
font-size: 18px !important;
The example css code will change the font color to red and increase font-size to 18px.
Hope this help. Please let us know if you need further assistance.