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Go to wp console, then click to Accessibility spring in sidebar and enable options that you need to start to work.

Change font size

Mudar Tamanho da Fonte

Scale page^beta

Mudar Tamanho da Página

Grayscale

Tons de Cinza

Sepia

Sépia

High contrast

Alto Contraste

Invert color

Inverter Cores

Contrast cursor

Contraste no Cursor

Highlight links

Destacar Links

Modelo Declaração do Aluno